Ford Fiesta Engine Malfunction Service Now: Causes, Fixes, and What to Do

Seeing the “Ford Fiesta Engine Malfunction Service Now” message appear on the dashboard can make your stomach drop. One moment, the car seems perfectly normal; the next, it is warning us that something inside the engine management system needs attention.

Does this message mean the engine is about to fail? Not necessarily.

Sometimes, the warning comes from a relatively minor sensor problem. In other situations, it can point to an ignition fault, turbocharger issue, fuel-system problem, overheating condition, or electrical failure that needs immediate investigation.

The difficult part is that the dashboard message rarely tells us exactly what has gone wrong. It acts more like a smoke alarm than a full diagnosis. It warns us that the engine control module has detected something unusual, but we still need to find the source.

In this guide, we will explain what the warning means, why it appears, which Ford Fiesta models may experience it, how serious it can be, and what we should do before replacing expensive parts.

What Does “Engine Malfunction Service Now” Mean on a Ford Fiesta?

The Engine Malfunction Service Now message means the Fiesta’s onboard computer has detected a fault affecting the engine, emissions system, fuel delivery, ignition system, turbocharger, or another electronically controlled component.

Modern Ford Fiesta engines rely on a network of sensors and control modules. These components constantly measure variables such as:

• Airflow entering the engine
• Fuel pressure
• Exhaust oxygen levels
• Turbo boost pressure
• Engine temperature
• Throttle position
• Crankshaft speed
• Camshaft position
• Exhaust gas recirculation
• Diesel particulate filter performance

When one of these readings falls outside its expected range, the powertrain control module stores a diagnostic trouble code and may display the warning.

The car might continue driving normally, enter reduced-power mode, run roughly, or refuse to start. The reaction depends on the type and severity of the detected fault.

Is It the Same as the Check Engine Light?

The two warnings are closely related, but they are not always identical.

The check engine light usually indicates that the engine management or emissions system has stored a fault. The Engine Malfunction Service Now message is a more direct instruction telling us that professional inspection is recommended.

Both can appear at the same time. In some cases, the dashboard message appears before the check engine light becomes noticeable.

What If the Warning Disappears?

A warning that disappears should not automatically be ignored.

An intermittent fault may come and go because of:

• Loose electrical connections
• Temporary voltage drops
• Sensor readings near their limits
• Moisture inside a connector
• A sticking valve
• An ignition coil beginning to fail
• Fuel pressure that occasionally drops

The message may clear after restarting the engine, while the fault code remains stored in the computer. Reading that stored code can reveal the problem before it becomes more serious.

Can We Continue Driving the Ford Fiesta?

Whether we can continue driving depends on how the car behaves and which additional warning lights appear.

If the message appears but the Fiesta still runs smoothly, maintains normal temperature, and shows no signs of power loss, we may be able to drive carefully to a repair shop.

However, continuing to drive becomes risky when the vehicle displays additional symptoms.

Stop Driving If You Notice These Symptoms

We should pull over safely and switch off the engine if we notice:

• A flashing check engine light
• Severe engine shaking
• Loud knocking or metallic noises
• Smoke from the exhaust or engine bay
• Rapidly rising coolant temperature
• Oil-pressure warning light
• Strong fuel smell
• Major loss of power
• The engine repeatedly stalling
• Difficulty controlling vehicle speed

A flashing engine light often suggests an active misfire. Unburned fuel can enter the catalytic converter, creating extreme heat and potentially ruining an expensive emissions component.

Driving an overheating engine can also turn a manageable coolant leak into a warped cylinder head or failed head gasket.

When Limp Mode Activates

A Ford Fiesta may enter limp mode, also called reduced-power mode, when the engine control system detects a fault that could cause damage.

In limp mode, we may notice:

• Slow acceleration
• Limited engine speed
• Reduced turbo boost
• Difficulty climbing hills
• Restricted transmission operation
• Unresponsive throttle behavior

Limp mode is the car’s way of protecting itself. It is like an athlete continuing with a sprained ankle: movement may still be possible, but pushing harder can make the damage worse.

Most Common Causes of the Ford Fiesta Engine Malfunction Warning

There is no single cause behind this message. The exact problem depends on the Fiesta’s engine, age, fuel type, maintenance history, and stored diagnostic codes.

Still, several faults appear more often than others.

1. Faulty Ignition Coil

Petrol Ford Fiesta engines use ignition coils to create the high voltage required by the spark plugs.

When a coil begins to fail, one cylinder may not burn fuel correctly. This causes a misfire and can trigger the engine malfunction warning.

Common symptoms include:

• Rough idle
• Hesitation during acceleration
• Engine vibration
• Reduced fuel economy
• Flashing engine light
• Lack of power
• Fuel smell from the exhaust

A failing ignition coil may work normally when the engine is cold and break down after heating up. This can make the fault frustratingly intermittent.

How the Coil Is Tested

A technician may use a scan tool to identify which cylinder is misfiring. The coil can then be moved to another cylinder.

If the misfire follows the coil, the coil is probably faulty. This simple swap test can prevent us from replacing unrelated parts.

2. Worn or Incorrect Spark Plugs

Spark plugs ignite the air-fuel mixture inside the cylinders. Over time, their electrodes wear and the gap becomes larger.

Worn plugs force the ignition coils to work harder. Eventually, the engine may misfire under acceleration, especially when climbing hills or carrying a heavy load.

Spark-plug problems can cause:

• Difficult starting
• Unstable idle
• Jerking under acceleration
• Poor fuel economy
• Reduced engine performance
• Ignition-coil damage

Using the wrong plug type or incorrect electrode gap can create similar symptoms. For that reason, replacement plugs should match the engine specification rather than simply looking similar.

3. Weak or Failing Battery

A weak battery might seem unrelated to an engine malfunction warning, but modern cars depend heavily on stable voltage.

When battery voltage falls too low, control modules can lose communication or record misleading sensor errors. The warning may appear during starting, especially on cold mornings.

Possible clues include:

• Slow engine cranking
• Dashboard lights flickering
• Multiple warnings appearing together
• Stop-start system unavailable
• Clock or radio settings resetting
• Warning disappearing after a longer drive

The battery, charging system, and alternator output should be tested before expensive electronic components are replaced.

Why Voltage Matters So Much

Sensors and modules communicate using precise electrical signals. When voltage becomes unstable, the system can behave like a phone call with poor reception: information arrives late, distorted, or not at all.

4. Damaged Oxygen Sensor

The oxygen sensors measure the amount of oxygen in the exhaust gases. The engine computer uses this information to adjust the fuel mixture and monitor catalytic converter performance.

A faulty oxygen sensor can cause:

• Higher fuel consumption
• Uneven idle
• Increased exhaust emissions
• Sluggish acceleration
• Check engine light
• Rich or lean mixture codes

An oxygen-sensor fault does not always mean the sensor itself is defective. Exhaust leaks, wiring damage, fuel-pressure problems, and vacuum leaks can produce similar readings.

Replacing the sensor without confirming the cause can be an expensive guessing game.

5. Dirty or Faulty Mass Airflow Sensor

The mass airflow sensor measures how much air enters the engine.

If the sensor becomes contaminated or sends inaccurate information, the computer may inject too much or too little fuel. The Fiesta may then hesitate, stall, or struggle to accelerate.

Symptoms can include:

• Flat acceleration
• Rough idle
• Black exhaust smoke
• Excessive fuel use
• Engine stalling
• Reduced power
• Difficult starting

Some sensors can be cleaned using the correct specialist cleaner, but aggressive chemicals or physical contact can damage the delicate sensing element.

6. Throttle Body or Throttle Position Fault

Many Ford Fiesta models use an electronic throttle body rather than a traditional mechanical throttle cable.

When carbon buildup restricts the throttle plate or the position sensor sends incorrect readings, the car may display the engine malfunction warning and enter limp mode.

We may experience:

• Delayed throttle response
• Unstable idle
• Engine stalling
• High idle speed
• Sudden power reduction
• Poor acceleration
• Throttle-related diagnostic codes

Cleaning the throttle body may solve minor contamination, but electronic motor or sensor failure may require replacement and recalibration.

7. Fuel Injector Problems

Fuel injectors deliver carefully measured amounts of fuel into the engine.

An injector may become clogged, leak, stick open, or develop an electrical fault. When this happens, one cylinder can run too rich or too lean.

Typical signs include:

• Rough engine operation
• Misfire codes
• Fuel smell
• Difficult hot starting
• Increased fuel consumption
• White, grey, or black exhaust smoke
• Poor acceleration

A leaking injector can wash oil from the cylinder wall and contaminate the engine oil with fuel. Therefore, persistent injector symptoms should not be ignored.

8. Low Fuel Pressure

The engine requires consistent fuel pressure to run correctly.

Low pressure may result from:

• A weak fuel pump
• Blocked fuel filter
• Faulty fuel-pressure sensor
• Damaged wiring
• Failing pump control module
• Leaking injector
• Pressure-regulator problem

A Fiesta with low fuel pressure may start normally at first and then hesitate under hard acceleration. It may also stall when the fuel level is low or when the engine is hot.

Why Guessing at Fuel-System Faults Is Risky

Fuel problems can produce symptoms that resemble ignition or airflow faults. Accurate pressure testing and live scan data are far more useful than replacing parts one by one.

9. Turbocharger or Boost-Pressure Problem

Turbocharged Fiesta engines depend on controlled boost pressure to deliver power efficiently.

The warning can appear when the system detects too much boost, too little boost, or a disagreement between expected and measured pressure.

Possible causes include:

• Split intercooler hose
• Loose boost pipe
• Faulty boost-pressure sensor
• Wastegate problem
• Turbo actuator failure
• Vacuum leak
• Worn turbocharger
• Carbon buildup
• Damaged intercooler

Common symptoms are:

• Whistling or hissing sounds
• Sudden loss of power
• Excessive exhaust smoke
• Limp mode
• Poor acceleration
• Oil consumption
• Underboost or overboost codes

A split hose can create dramatic power loss while costing far less to repair than a complete turbocharger. Inspecting the pipework first makes good sense.

10. Exhaust Gas Recirculation Valve Failure

Diesel Fiesta engines often use an exhaust gas recirculation valve, commonly called the EGR valve, to reduce nitrogen oxide emissions.

Soot and oily deposits can cause the valve to stick.

An EGR problem may produce:

• Rough idle
• Black smoke
• Reduced power
• Hesitation
• Poor fuel economy
• Frequent stalling
• Engine malfunction warning

Cleaning may help when the valve is simply contaminated. However, damaged internal electronics or severe mechanical wear usually require replacement.

11. Diesel Particulate Filter Blockage

Diesel models use a diesel particulate filter, or DPF, to trap soot from the exhaust.

The filter periodically burns off accumulated soot during regeneration. If the car mainly travels on short urban journeys, the exhaust may not become hot enough to complete this process.

A blocked DPF may cause:

• Engine malfunction message
• Reduced power
• Increased fuel consumption
• Cooling fan running frequently
• Higher idle speed
• Strong hot smell
• DPF warning light
• Limp mode

Can a Motorway Drive Clear the DPF?

A sustained drive may help only when the filter is moderately loaded and the engine has no other faults preventing regeneration.

It will not fix every DPF problem. If the filter is heavily blocked, forcing the car to continue driving can increase exhaust back pressure and place additional strain on the turbocharger.

A diagnostic scan should determine soot loading, pressure readings, regeneration history, and whether another fault caused the blockage.

12. Coolant Temperature Sensor Fault

The coolant temperature sensor tells the computer how warm the engine is.

An inaccurate reading can affect fuel mixture, cooling-fan operation, starting behavior, and emissions control.

Possible symptoms include:

• Cooling fan running constantly
• Poor cold starting
• Excessive fuel use
• Incorrect temperature-gauge reading
• Rough engine operation
• Warning appearing soon after startup

The sensor may be defective, but damaged wiring, low coolant, air trapped in the cooling system, or thermostat problems can produce related symptoms.

13. Camshaft or Crankshaft Position Sensor Failure

The crankshaft and camshaft sensors help the computer determine engine speed and valve timing.

If either signal becomes unreliable, the engine may cut out or refuse to start.

Warning signs include:

• Long cranking
• Sudden stalling
• Intermittent no-start condition
• Jerking while driving
• Loss of power
• Engine warning message
• Engine cutting out when hot

Heat-related sensor failure is particularly common. The car may restart after cooling down, making the fault appear almost mysterious.

14. Timing Belt or Timing Correlation Problem

Some Ford Fiesta engines use a timing belt, while others may use different timing-drive arrangements depending on the engine and production year.

If the belt stretches, deteriorates, loses tension, or allows the camshaft and crankshaft timing to move out of alignment, the engine computer may record correlation faults.

Possible symptoms include:

• Rattling or unusual engine noise
• Difficult starting
• Rough idle
• Poor performance
• Timing-related fault codes
• Engine warning
• Complete engine failure

Certain Fiesta engines use a belt that operates in engine oil, often described as a wet belt. Correct oil specification and maintenance are especially important because contamination or deterioration can damage the belt material.

Why Timing Problems Need Immediate Attention

A timing-drive fault is not something we should postpone. If the belt fails on an interference engine, pistons and valves may collide, turning a maintenance issue into major engine damage.

15. Wiring, Connector, or Ground Fault

Not every warning is caused by a failed mechanical component.

Engine-bay heat, moisture, vibration, road salt, previous repairs, and rodent damage can affect wiring and connectors.

Electrical faults may cause:

• Intermittent warning messages
• Several unrelated fault codes
• Sensor signal errors
• Communication faults
• Random stalling
• No-start conditions
• Warning that appears after rain

A technician should inspect connector pins, wiring continuity, ground points, and power supplies before condemning an expensive sensor or control module.

Common Symptoms That Appear with the Warning

The dashboard message may appear alone or alongside noticeable driving problems.

Loss of Engine Power

Loss of power often indicates that the computer has restricted performance to protect the engine.

Likely areas include:

• Turbo boost system
• Throttle body
• Fuel pressure
• DPF restriction
• Airflow sensor
• EGR valve

Rough Idle and Shaking

A shaking engine usually points toward incomplete combustion.

Common causes include:

• Ignition coil failure
• Worn spark plugs
• Injector fault
• Vacuum leak
• Compression problem
• Incorrect air-fuel mixture

Jerking During Acceleration

Jerking may occur when fuel delivery, ignition, or boost pressure becomes inconsistent.

The problem often feels as though someone is briefly tapping the brake while we accelerate.

Engine Starts but Immediately Stalls

This symptom can involve:

• Crankshaft sensor
• Fuel-pressure problem
• Immobilizer issue
• Throttle-body fault
• Major vacuum leak
• Electrical supply failure

Engine Will Not Start

A no-start condition requires us to determine whether the engine is cranking.

If it does not crank, we should investigate the battery, starter, wiring, ignition switch, or immobilizer system.

If it cranks but does not start, the cause may involve fuel pressure, ignition, timing, compression, or engine-position sensor signals.

How to Diagnose the Warning Correctly

A reliable diagnosis begins with evidence, not guesses.

Step 1: Observe the Dashboard

We should note every warning light and message, not only the main engine malfunction alert.

The following details matter:

• Is the check engine light steady or flashing?
• Is the oil light illuminated?
• Is the temperature gauge high?
• Is the battery light on?
• Does the warning appear only during acceleration?
• Does it disappear after restarting?

These observations can narrow the search considerably.

Step 2: Listen and Smell

Unusual sounds and smells can provide valuable clues.

Listen for:

• Hissing from a boost leak
• Metallic knocking
• Timing-belt noise
• Uneven exhaust rhythm
• Loud injector ticking
• Turbo whining

Pay attention to:

• Fuel smell
• Burning oil
• Overheated coolant
• Electrical burning
• Sulphur-like catalytic converter smell

We should avoid touching hot engine components or opening the coolant reservoir while the engine is hot.

Step 3: Check Basic Fluid Levels

With the car parked safely and the engine cool, check:

• Engine-oil level
• Coolant level
• Brake-fluid level
• Visible fluid leaks

Low oil or coolant can lead to severe damage. However, topping up fluid does not eliminate the need to identify where it went.

Step 4: Inspect Visible Hoses and Connectors

Look for:

• Loose intake pipes
• Split turbo hoses
• Disconnected sensors
• Damaged wiring
• Corroded battery terminals
• Oil contamination around connectors
• Vacuum hoses that have fallen off

A loose connection can cause a warning that seems far more serious than the actual repair.

Step 5: Read the Diagnostic Trouble Codes

An OBD-II scanner connects to the diagnostic port and reads stored fault codes.

Examples may include:

• P0300: Random or multiple-cylinder misfire
• P0301–P0304: Misfire on a specific cylinder
• P0100-series: Airflow-sensor faults
• P0299: Turbo underboost
• P0234: Turbo overboost
• P0400-series: EGR faults
• P0420: Catalytic converter efficiency
• P2002: DPF efficiency problem
• P0016: Crankshaft and camshaft correlation
• P0087: Fuel-rail pressure too low

The code identifies the system that detected the problem, not always the exact failed part.

For example, a lean-mixture code does not automatically prove that the oxygen sensor is faulty. It may be reporting a real vacuum leak.

Why Live Data Matters

A professional scan tool can display real-time information such as:

• Fuel-pressure readings
• Airflow values
• Coolant temperature
• Misfire counts
• Turbo boost
• Oxygen-sensor behavior
• DPF pressure
• Throttle position

Live data helps us understand what the engine is doing rather than relying on a single stored code.

Can We Reset the Engine Malfunction Message?

The warning may disappear after disconnecting the battery, clearing the codes, or restarting the car.

But resetting the message is not the same as repairing the fault.

If the underlying problem remains, the warning will usually return after the computer repeats its self-tests.

When Clearing the Code Is Useful

Clearing a code can be useful after:

• Completing a confirmed repair
• Reconnecting a loose plug
• Replacing a failed component
• Correcting low battery voltage
• Testing whether an intermittent fault returns

Before clearing anything, we should record the codes and freeze-frame data. Freeze-frame information captures engine conditions at the moment the fault occurred and can be extremely valuable.

Can Disconnecting the Battery Fix It?

Disconnecting the battery may temporarily reset certain warning messages, but it is not a dependable repair method.

It can also reset:

• Clock settings
• Radio presets
• Window calibration
• Steering-angle information
• Idle adaptations
• Stop-start system data

Some vehicles may require additional procedures after reconnection. If the battery itself is weak, replacement and proper battery-system reset may be necessary.

How Much Does It Cost to Repair?

Repair costs vary widely because the dashboard message can represent dozens of different problems.

A minor repair might involve a loose hose, damaged connector, worn spark plug, or weak battery. A more expensive repair could involve the turbocharger, DPF, fuel injectors, catalytic converter, timing system, or internal engine components.

The total cost depends on:

• Fiesta model and engine
• Petrol or diesel configuration
• Part quality
• Local labor rates
• Diagnostic time
• Extent of secondary damage
• Whether programming is required

Avoid Replacing Parts Based Only on a Code

A fault code should guide testing, not replace it.

Throwing parts at the car can quickly become costly. We might replace an oxygen sensor only to discover that a split intake hose was causing the lean reading.

Good diagnosis often costs less than bad guessing.

Ford Fiesta EcoBoost Considerations

EcoBoost engines combine turbocharging, direct injection, electronic boost control, and advanced engine management.

This improves performance and efficiency, but it also creates more possible failure points.

EcoBoost-related warnings may involve:

• Boost leaks
• Turbo actuator faults
• Coolant-system problems
• Ignition-coil failure
• Spark-plug wear
• Fuel-pressure faults
• Carbon buildup
• Timing-belt deterioration
• Sensor or wiring problems

Regular oil changes using the correct specification are critical. Turbochargers and timing components rely on clean, suitable oil for lubrication and long-term protection.

Ford Fiesta Diesel Considerations

Diesel Fiesta models introduce additional emissions equipment that petrol engines may not use.

Common diesel-related areas include:

• DPF blockage
• EGR contamination
• Injector problems
• Fuel-pressure faults
• Turbo boost leaks
• Glow-plug faults
• Exhaust-pressure sensors
• Airflow-sensor errors

Frequent short trips can be particularly demanding on a diesel emissions system. The engine may rarely reach the conditions required for a successful DPF regeneration.

How to Prevent the Warning from Returning

We cannot prevent every electronic or mechanical failure, but sensible maintenance can reduce the risk.

Follow the Correct Service Schedule

Routine maintenance should include:

• Timely oil and filter changes
• Correct oil specification
• Spark-plug replacement
• Air-filter inspection
• Fuel-filter replacement where applicable
• Coolant checks
• Timing-belt inspection or replacement
• Battery and charging-system testing

Do Not Ignore Small Symptoms

A slight hesitation today can become a roadside breakdown tomorrow.

Early warning signs may include:

• Longer starting time
• Occasional rough idle
• Brief loss of power
• Falling fuel economy
• Intermittent warning lights
• New engine noises
• Frequent coolant top-ups

Use Quality Replacement Parts

Low-quality sensors, filters, spark plugs, and ignition components may produce inconsistent signals or fail prematurely.

The cheapest part on the shelf can sometimes become the most expensive once repeated labor and diagnostics are included.

Give Diesel Engines Suitable Journeys

Diesel models benefit from occasional longer journeys that allow the engine and exhaust system to reach full operating temperature.

However, a long drive should never be used as a universal cure when warning lights, severe power loss, overheating, or mechanical noises are present.

Keep the Battery Healthy

A healthy battery supports reliable module communication and stable sensor operation.

Have it tested if:

• Starting becomes slower
• Stop-start stops working
• The battery is several years old
• Multiple warnings appear during startup
• The car has been parked for a long period

Mistakes to Avoid When the Message Appears

When faced with an alarming dashboard warning, it is easy to make rushed decisions.

Avoid these common mistakes:

1. Continuing to drive despite severe shaking
2. Clearing codes before recording them
3. Replacing a sensor only because its name appears in a code
4. Ignoring low oil or coolant
5. Assuming the warning disappeared permanently
6. Using incorrect engine oil
7. Buying several parts before performing basic tests
8. Forcing a DPF regeneration without checking fault conditions
9. Ignoring a flashing check engine light
10. Disconnecting the battery repeatedly to hide the warning

Should We Visit a Ford Dealer or Independent Garage?

Both can be suitable depending on the problem.

A Ford dealer may offer:

• Manufacturer-specific diagnostic tools
• Access to technical service information
• Software updates
• Module programming
• Familiarity with model-specific faults

A qualified independent specialist may provide:

• Lower labor rates
• More flexible repair options
• Reconditioned component choices
• Strong experience with common Fiesta problems
• More personal communication

The quality of the technician matters more than the logo above the workshop door. We should look for a garage that diagnoses the fault before recommending replacement parts.

Questions to Ask the Mechanic

Useful questions include:

• Which fault codes were stored?
• Were the codes current, pending, or historic?
• What tests confirmed the failed component?
• Was wiring checked?
• Were live-data readings compared with specifications?
• Could another fault have caused this code?
• Are there software updates available?
• Does the repair include calibration or programming?
• Are the replacement parts original, aftermarket, or reconditioned?
• What happens if the warning returns?

A good technician should be able to explain the diagnosis in plain language.

Final Thoughts on the Ford Fiesta Engine Malfunction Service Now Warning

The Ford Fiesta Engine Malfunction Service Now message should be taken seriously, but it does not automatically mean the engine is ruined.

The cause may be as simple as a weak battery, worn spark plug, split hose, dirty sensor, or loose electrical connector. It may also involve a more significant problem such as turbo failure, low fuel pressure, DPF blockage, injector trouble, overheating, or timing-system damage.

The best approach is calm and methodical.

We should observe how the car behaves, check for urgent warning signs, inspect basic fluid levels, read the stored diagnostic codes, and test the affected system before buying parts.

Think of the warning as the car knocking on the door rather than kicking it down. It is giving us a chance to investigate. Responding early can be the difference between a straightforward repair and a very expensive recovery truck ride.

Frequently Asked Questions

1. Why does my Ford Fiesta say Engine Malfunction Service Now but drive normally?

The computer may have detected an intermittent sensor, emissions, voltage, ignition, or communication fault that has not yet affected performance. The vehicle should still be scanned because a stored code may reveal a developing problem.

2. Can a low battery cause the Ford Fiesta engine malfunction warning?

Yes. Low or unstable voltage can disrupt module communication and sensor readings. This may produce several warnings during startup. The battery and alternator should be tested before complex electrical parts are replaced.

3. Why does the warning disappear when I restart the car?

Restarting can temporarily remove limp mode or clear an active warning display. However, the diagnostic code may remain stored. A disappearing message often indicates an intermittent fault rather than a permanent repair.

4. Can bad spark plugs trigger Engine Malfunction Service Now?

Yes. Worn, damaged, contaminated, or incorrectly gapped spark plugs can cause misfires. The computer detects uneven combustion and may display the warning, reduce engine power, or flash the check engine light.

5. How urgent is the Ford Fiesta engine malfunction message?

It depends on the symptoms. If the car runs normally and no critical lights appear, drive cautiously to a workshop. Stop immediately if the engine shakes severely, overheats, loses oil pressure, produces smoke, makes loud noises, or displays a flashing engine light.

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