Buick Encore Engine Problems: Symptoms, Causes, and Solutions

The Buick Encore has carved out a comfortable niche in the small-SUV world. It is compact enough to squeeze into crowded parking spaces, tall enough to provide a confident driving position, and generally more refined than many budget crossovers. Yet beneath that polished exterior, certain model years can develop engine problems that turn a quiet commute into a dashboard-light detective story.

Does that mean every Buick Encore is unreliable? Not at all. Plenty of owners drive their Encores for years without facing a major engine repair. However, the vehicle’s small turbocharged engines rely on a network of vacuum lines, sensors, cooling components, oil passages, and emissions equipment. When one part stumbles, the effects can spread through the engine like a loose thread unraveling a sweater.

In this guide, we will explore the most widely discussed Buick Encore engine problems, the symptoms that deserve immediate attention, the model years that require extra scrutiny, and the practical steps we can take before approving an expensive repair.

Understanding the Buick Encore Engine Lineup

Before diagnosing anything, we need to clarify which vehicle and engine we are discussing. The original North American Buick Encore and the newer Encore GX are related in name, but they do not use the same powertrain.

The Original Buick Encore’s 1.4-Liter Turbo Engine

The first-generation Buick Encore, introduced for the 2013 model year, primarily used a 1.4-liter turbocharged four-cylinder engine. Early versions produced approximately 138 horsepower and 148 lb-ft of torque, paired with a six-speed automatic transmission.

This engine can deliver decent low-speed torque and acceptable fuel economy, but it has several interconnected systems that become troublesome when maintenance is delayed. The positive crankcase ventilation system, turbocharger controls, cooling system, ignition components, and intake plumbing all deserve attention.

The Buick Encore GX Uses Different Engines

The Encore GX arrived as a larger and mechanically different crossover. Depending on the year and configuration, it has used turbocharged three-cylinder engines. For example, Buick described the 2024 Encore GX as offering a standard 1.2-liter turbo engine with 137 horsepower and an available 1.3-liter turbo engine with 155 horsepower.

This distinction matters. Advice about a 2015 Encore’s 1.4-liter four-cylinder engine may not apply to a 2024 Encore GX. Before ordering parts, we should always confirm:

• The exact model name
• Model year
• Engine size
• Vehicle identification number
• Diagnostic trouble codes
• Whether the vehicle has front- or all-wheel drive

Without those details, diagnosing an Encore is like trying to unlock a door with a handful of random keys. One might fit, but guessing can become expensive.

What Are the Most Common Buick Encore Engine Problems?

The problems most frequently associated with the original Encore’s 1.4-liter turbo engine include:

1. Turbocharger underboost or wastegate problems
2. PCV-system and valve-cover failures
3. Oil leaks and abnormal crankcase pressure
4. Coolant leaks and overheating
5. Ignition-coil and spark-plug problems
6. Rough idle or engine stalling
7. Intake and vacuum leaks
8. Cold-weather charge-air-cooler icing
9. Reduced engine power
10. Timing-system noise or internal wear

These issues do not affect every vehicle equally. Mileage, climate, maintenance history, driving habits, and previous repairs all influence what may fail.

Turbocharger Failure and Underboost Codes

The turbocharger is one of the most important—and potentially expensive—components on the Encore’s small engine. It compresses incoming air so that the 1.4-liter engine can produce stronger torque without becoming physically larger.

When it works correctly, the turbo feels almost invisible. When it does not, the Encore may suddenly feel as though it is towing an invisible trailer.

Symptoms of a Failing Buick Encore Turbo

Possible turbocharger or boost-control symptoms include:

• Noticeable loss of acceleration
• Check-engine light
• Reduced-engine-power warning
• Whistling, rattling, or metallic noises
• Blue or grey exhaust smoke
• Increased oil consumption
• Poor fuel economy
• Hesitation under load
• Diagnostic code P0299
• Occasional code P0234

P0299 generally indicates an underboost condition, meaning the engine is not receiving the boost pressure the computer expects. However, the code does not automatically prove that the complete turbocharger needs replacement.

General Motors issued technical guidance explaining that P0299 can be associated with loss of wastegate preload. Wear at the wastegate actuator connection may be visible, but technicians must determine whether proper preload has actually been lost before condemning the assembly.

Why Turbo Misdiagnosis Happens

Several faults can imitate a damaged turbo:

• Cracked or disconnected charge pipes
• Loose clamps
• Intake leaks
• Faulty boost-control solenoid
• Wastegate linkage problems
• Restricted air intake
• Faulty pressure sensor
• PCV-system malfunction
• Exhaust restriction
• Charge-air-cooler icing

Replacing the turbo without testing these components is like replacing an entire faucet because the washer is leaking. The large repair may hide the symptom, but it does not guarantee that the original diagnosis was correct.

Special Coverage for Certain 2017–2018 Vehicles

General Motors issued special coverage related to turbocharger replacement for certain 2017 and 2018 Buick Encore vehicles equipped with the applicable engine. Eligibility depends on the vehicle’s VIN, age, mileage, region, and coverage terms—not merely the model year.

Owners experiencing underboost should ask a Buick or GM dealer to check the VIN for open recalls, special coverage programs, and service campaigns before paying out of pocket.

PCV-System and Valve-Cover Problems

The positive crankcase ventilation system is one of the most important parts of the Encore engine that many owners have never heard of. It manages vapours and pressure inside the crankcase, routing them back through the intake so they can be burned.

When the system becomes restricted, damaged, or unbalanced, crankcase pressure can rise. That pressure searches for an escape route, often pushing oil through seals and gaskets.

Common PCV Failure Symptoms

A malfunctioning PCV system may cause:

• Rough idle
• Whistling or squealing
• Oil leaks
• Burning-oil smell
• Excessive vacuum at the oil cap
• Positive crankcase pressure
• Check-engine light
• Lean-running codes
• Stalling
• Poor acceleration
• Oil inside intake plumbing

GM service information has linked certain engine-oil leaks and diagnostic code P1101 with higher-than-normal crankcase pressure caused by a plugged PCV orifice. The recommended diagnostic process includes testing crankcase pressure rather than simply replacing whichever gasket appears wet.

Why Replacing Only the Valve Cover May Not Work

The PCV system is not always confined to a single replaceable valve. Depending on the engine configuration, related passages and check-valve functions may involve the valve cover, intake manifold, hoses, and internal orifices.

Suppose a technician replaces a leaking valve cover but ignores a blocked intake-manifold passage. The fresh gasket may stop leaking for a while, yet excessive pressure remains. Eventually, oil finds another exit.

A complete diagnosis should inspect the system as a whole rather than treating the visible leak as an isolated problem.

Buick Encore Oil Leaks

Oil leaks are among the most recognizable Buick Encore engine complaints. Some are minor seepage issues; others indicate a larger crankcase-pressure or lubrication problem.

Common Oil-Leak Locations

Oil may appear around the:

• Valve-cover gasket
• Front crankshaft seal
• Camshaft seals
• Oil-pan sealing surface
• Turbo oil-feed or return lines
• Oil-filter housing area
• Timing-cover area
• PCV-related connections

The first wet component is not always the source. Oil travels downward and backward while the car moves, coating parts far from the original leak. A proper inspection may require cleaning the engine, adding ultraviolet dye, driving the vehicle, and checking it under ultraviolet light.

Why Oil Leaks Should Not Be Ignored

A few drops on the driveway may not seem dramatic. Yet a slow leak can gradually lower the oil level until the turbocharger and internal bearings are starved of lubrication.

Turbochargers spin at extremely high speeds and depend on a steady supply of clean oil. Running low is like asking a marathon runner to continue without water—the damage may not appear immediately, but the risk climbs with every mile.

We should check the dipstick regularly, especially on an older Encore or one with a known leak. The dashboard oil-life percentage estimates oil service life; it does not directly measure how much oil remains in the engine.

Coolant Leaks and Overheating

The Encore’s turbocharged engine produces considerable heat within a small package. Cooling-system health is therefore critical.

Common sources of coolant loss may include:

• Water-pump area
• Thermostat housing
• Coolant outlet components
• Radiator hoses
• Turbocharger coolant lines
• Expansion tank
• Radiator
• Hose connections and seals

Signs of a Coolant Problem

Watch for:

• Sweet smell after driving
• Wet spots beneath the front of the vehicle
• Low coolant in the reservoir
• Engine-temperature warning
• Steam from under the hood
• Heater suddenly blowing cold air
• Gurgling behind the dashboard
• White residue around hose connections
• Repeated need to add coolant

GM technical information has cautioned that an apparent coolant leak near the turbo does not necessarily mean coolant is leaking internally through the turbocharger. Coolant pipes, fittings, and nearby connections must also be checked.

What to Do When the Encore Overheats

If the temperature warning appears or steam is visible, we should stop as soon as it is safe. Continuing to drive can warp the cylinder head, damage the head gasket, degrade the oil, and turn a manageable cooling-system repair into an engine replacement.

Never open a pressurized coolant reservoir while the engine is hot. Scalding coolant can erupt without warning.

Cold-Weather Charge-Air-Cooler Icing

One of the more unusual Buick Encore engine problems can appear in extremely cold weather. Moisture may accumulate and freeze within the charge-air-cooling or PCV-related system, disrupting airflow and boost control.

GM issued a bulletin concerning 2013–2020 Buick Encore models with the 1.4-liter LUV engine. Reported symptoms included poor performance in extreme cold, loss of power, and various turbo or pressure-related diagnostic codes, including P0299, P0234, P0236, P2261, P2227, and P00C7.

Symptoms of Cold-Weather Icing

Drivers may notice:

• Loss of power immediately after starting
• Hesitation
• Stalling
• Smoke from the exhaust
• Burning-oil odour
• Check-engine light
• Performance improving after the vehicle warms
• Repeated issues in sub-zero conditions

Related GM guidance has described loss of power, hesitation, stalling, tailpipe smoke, oil odour, and symptoms that may diminish after driving.

Why Climate Matters

An Encore that behaves perfectly during summer may stumble during a bitter winter morning. Moisture, freezing temperatures, short trips, and incomplete engine warm-up can combine to create sludge or ice within ventilation and intake components.

This is not the sort of problem we should diagnose by replacing random sensors. A technician familiar with GM’s cold-weather procedures should inspect the charge-air cooler, PCV plumbing, intake passages, and related updates.

Rough Idle and Engine Stalling

A healthy Encore should idle consistently. A slight vibration from a compact turbo engine can be normal, but shaking, surging, or repeated stalling points to a fault.

Possible Causes of Rough Idle

Common possibilities include:

• Vacuum leak
• Failing ignition coil
• Worn spark plugs
• Dirty throttle body
• Fuel-injector problem
• PCV-system leak
• Intake-manifold leak
• Faulty mass-airflow or pressure sensor
• Weak battery or charging problem
• Carbon accumulation
• Low fuel pressure
• Incorrect valve timing

A rough idle often becomes more noticeable when the air conditioning is operating, the transmission is in Drive, or electrical loads are high.

When Stalling Becomes Dangerous

An engine that stalls while parking is inconvenient. An engine that stalls while crossing traffic is a safety concern. Repeated stalling deserves immediate diagnosis even when the engine restarts normally.

We should record the conditions surrounding each event:

• Was the engine cold or warm?
• Was the fuel tank nearly empty?
• Did the air conditioning operate?
• Did the check-engine light flash?
• Did the vehicle stall at idle or under acceleration?
• Were any warning messages displayed?
• Did the engine restart immediately?

Those details help a technician recreate the fault instead of hunting blindly.

Ignition-Coil and Spark-Plug Problems

Ignition components live a demanding life in a turbocharged engine. Heat, vibration, oil contamination, incorrect plug gaps, and age can weaken the spark.

Symptoms of an Engine Misfire

A misfire may produce:

• Shaking under acceleration
• Rough idle
• Reduced power
• Flashing check-engine light
• Increased fuel use
• Fuel smell from the exhaust
• Hard starting
• Codes such as P0300 or cylinder-specific P0301–P0304

A flashing check-engine light is more urgent than a steady light. It can indicate an active misfire severe enough to overheat and damage the catalytic converter.

Do Not Replace Coils Without Testing

When one cylinder misfires, a technician can move the suspected ignition coil to another cylinder. If the misfire follows the coil, the diagnosis becomes stronger. Spark plugs should also be inspected for:

• Incorrect gap
• Heavy carbon
• Oil contamination
• Cracked porcelain
• Excessive wear
• Signs of overheating

Replacing all coils may sometimes be reasonable at high mileage, but testing first prevents unnecessary spending.

Intake, Vacuum, and Boost Leaks

The Encore depends on accurately measured airflow. A split hose or loose connection can introduce unmetered air, disrupting fuel mixture and turbo pressure.

Typical Air-Leak Symptoms

Possible clues include:

• Hissing
• Lean codes
• Rough idle
• Underboost
• Slow acceleration
• Stalling
• High or unstable idle
• Increased fuel consumption
• Whistling near the valve cover or intake

A smoke test is one of the best methods for finding small leaks. Low-pressure smoke is introduced into the intake system, revealing cracks and loose seals that may be invisible during an ordinary visual inspection.

Reduced Engine Power Warning

The “Reduced Engine Power” message can be alarming because the Encore may suddenly respond sluggishly to the accelerator. This is usually a protective strategy. The engine computer has detected a fault and limits performance to reduce the chance of further damage.

Possible triggers include:

• Turbo underboost or overboost
• Throttle-body fault
• Accelerator-pedal sensor problem
• Intake-pressure sensor failure
• Severe misfire
• Overheating
• Wiring fault
• Low system voltage
• PCV or vacuum malfunction

We should not assume that reduced power means the engine itself is ruined. It means the computer has identified a condition serious enough to restrict operation.

If the vehicle is shaking, overheating, smoking, or displaying a flashing check-engine light, stop driving. If it runs smoothly but lacks power, proceed cautiously only as far as necessary to reach a safe location or repair facility.

Timing-Chain Noise and Internal Engine Wear

The Encore’s engine uses a timing chain rather than a routine-replacement rubber timing belt. That does not mean the chain will last forever under every condition.

Warning Signs of Timing-System Trouble

Potential symptoms include:

• Rattle during cold start
• Persistent metallic noise
• Camshaft/crankshaft correlation codes
• Poor acceleration
• Rough running
• Hard starting
• Metal debris in the oil
• Check-engine light

Timing chains rely on clean oil, adequate oil pressure, functioning tensioners, and intact guides. Extended oil-change intervals, low oil levels, sludge, or incorrect oil specifications can accelerate wear.

A brief sound at startup does not automatically confirm timing-chain failure, but repeated rattling deserves investigation. If the chain jumps out of time, internal engine damage may follow.

Excessive Oil Consumption or Blue Smoke

Some Encore owners may notice that oil disappears between services even when no large external leak is visible.

Potential causes include:

• Turbocharger oil leakage
• PCV malfunction
• Worn piston rings
• Valve-stem-seal wear
• External seepage burning on hot surfaces
• Incorrect oil viscosity
• Extended high-load driving
• Internal engine wear

Blue smoke generally indicates oil entering the combustion process. Smoke after idling, during acceleration, or after deceleration may provide diagnostic clues.

We should document oil consumption carefully. Check the level on a flat surface under consistent conditions, record the mileage, add the correct oil as necessary, and measure how quickly the level drops. “It uses some oil” is vague; “it consumes one quart every 900 miles” gives a technician useful evidence.

Check-Engine-Light Codes Commonly Linked to Encore Problems

Diagnostic codes are clues, not replacement-part instructions.

Codes that may appear during Encore engine problems include:

• P0299: Turbocharger underboost
• P0234: Turbocharger overboost
• P1101: Intake-airflow or performance-related fault
• P0171: Fuel system running lean
• P0300: Random or multiple-cylinder misfire
• P0301–P0304: Cylinder-specific misfire
• P0420: Catalyst efficiency below threshold
• P0011/P0014: Camshaft timing performance
• P0236: Turbo boost-sensor performance
• P2261: Turbo bypass-valve performance

We should resist the temptation to search a code online and buy the first component mentioned. P0299 does not translate directly to “buy a turbo,” just as a fever does not identify a specific illness.

Which Buick Encore Years Have More Engine Concerns?

Older first-generation examples naturally receive more engine complaints because they have accumulated more years and mileage. Early and mid-cycle 1.4-liter models deserve particularly careful inspection for:

• PCV-system repairs
• Valve-cover replacement
• Intake-manifold work
• Turbocharger history
• Coolant leaks
• Oil leaks
• Underboost codes
• Cold-weather updates
• Repeated misfires

The 2017 and 2018 model years are especially worth checking for VIN-specific turbocharger special coverage.

However, model year alone should never determine whether we buy or reject a vehicle. A meticulously maintained older Encore can be a better purchase than a newer one that survived on neglected oil changes and temporary repairs.

How Long Can a Buick Encore Engine Last?

There is no universal expiration mileage. Engine life depends heavily on:

• Oil-change frequency
• Maintaining the correct oil level
• Cooling-system condition
• Driving environment
• Warm-up habits
• Repair quality
• Turbocharger care
• Frequency of short trips
• Previous overheating
• Whether warning lights were ignored

A well-maintained engine may provide many years of service. A neglected one can develop expensive problems at relatively modest mileage.

The strongest predictor is often not the number on the odometer but the quality of the maintenance records.

How to Diagnose Buick Encore Engine Problems Correctly

A sensible diagnostic process should move from evidence to conclusion.

Step 1: Scan All Modules

A professional scan tool should retrieve stored, pending, and history codes. Freeze-frame data can reveal engine speed, coolant temperature, boost pressure, and load at the moment the fault occurred.

Step 2: Check Oil and Coolant

Before sophisticated testing, confirm that the engine contains enough clean oil and coolant. Low fluid levels can both cause problems and reveal them.

Step 3: Inspect Hoses and Connections

Look for disconnected pipes, split vacuum lines, damaged wiring, loose clamps, oil-soaked connectors, and coolant residue.

Step 4: Test the PCV and Crankcase Pressure

Because PCV faults can imitate several unrelated problems, crankcase vacuum or pressure testing can save hours of guesswork.

Step 5: Test Boost Pressure

Compare requested boost with actual boost while monitoring wastegate control and pressure sensors.

Step 6: Check Ignition and Fuel Delivery

Inspect plugs, test coils, evaluate fuel trims, and confirm fuel pressure where applicable.

Step 7: Perform Mechanical Tests

Compression, leak-down, oil-pressure, or timing tests may be necessary when electronic and airflow checks do not identify the cause.

Estimated Buick Encore Engine Repair Costs

Costs vary significantly by country, labour rate, part quality, model year, and the extent of related damage. We should treat broad online estimates as planning figures rather than guaranteed quotes.

Generally:

• Spark plugs are usually a lower-cost repair.
• Ignition coils range from moderate to expensive depending on how many are replaced.
• Valve-cover or PCV repairs often fall in the moderate range.
• Intake-manifold replacement can be moderately expensive.
• Cooling-system repairs vary widely by the leaking component.
• Turbocharger replacement is typically one of the costliest common repairs.
• Timing-chain or internal engine repairs can become very expensive.
• Complete engine replacement may exceed the economic value of an older high-mileage Encore.

Before approving a major repair, request:

1. The exact diagnostic codes
2. Test results supporting the diagnosis
3. A breakdown of parts and labour
4. Whether related components are included
5. Warranty terms
6. Whether GM coverage applies
7. Whether updated parts or procedures are available

Can We Drive With a Buick Encore Engine Problem?

That depends on the symptom.

Stop Driving Immediately When:

• The oil-pressure warning stays on
• The engine overheats
• The check-engine light flashes
• Loud knocking is present
• Thick smoke exits the exhaust
• Coolant pours from the vehicle
• The engine repeatedly stalls in traffic
• The oil level is dangerously low
• The vehicle has almost no acceleration

Arrange Diagnosis Soon When:

• The check-engine light remains steady
• A mild oil leak is present
• Fuel economy drops suddenly
• The engine idles roughly
• A new whistle or hiss appears
• The coolant level slowly decreases
• Acceleration feels weaker than usual

Small turbocharged engines do not reward procrastination. A minor hose leak today may overwork the turbo tomorrow.

How to Prevent Major Buick Encore Engine Problems

We cannot prevent every component failure, but careful ownership reduces the odds.

Use the Correct Engine Oil

Follow the specification and viscosity listed in the owner’s manual for the exact engine and climate. Do not rely solely on generic advice for “all Buick Encores.”

Check the Oil Level Between Services

This takes only a few minutes and can protect both the engine and turbocharger.

Do Not Ignore Coolant Loss

Coolant does not normally disappear without a reason. Repeated topping-up is not a repair.

Allow Sensible Warm-Up

We do not need to idle for half an hour. Start the engine, allow it to settle briefly, and drive gently until it reaches normal operating temperature.

Avoid Shutting Down Immediately After Severe Load

After sustained high-speed driving, steep climbing, or heavy turbo use, a short period of gentle driving before shutdown can help temperatures stabilize.

Fix Misfires Promptly

An untreated misfire can damage the catalytic converter and create additional expenses.

Use Quality Parts

The cheapest sensor or hose may become the most expensive when it fails twice.

Check for Recalls and Special Coverage

NHTSA allows owners to search by VIN, licence plate, year, make, and model for recall information. Manufacturer communications and technical bulletins can also provide valuable context, although a bulletin is not automatically a free repair.

What to Inspect Before Buying a Used Buick Encore

A used Encore deserves more than a quick test drive around the block.

Pre-Purchase Checklist

• Start the engine completely cold
• Listen for timing or turbo rattles
• Check for blue or white smoke
• Inspect the coolant reservoir
• Check the oil level and condition
• Look for oil around the valve cover
• Scan for stored and pending codes
• Test acceleration under load
• Watch for reduced-power warnings
• Verify heater performance
• Confirm that the cooling fan operates
• Review oil-change records
• Ask about turbo and PCV repairs
• Check the VIN for coverage or recalls
• Arrange an independent inspection

Be Suspicious of a Recently Cleared Computer

If emissions monitors show “not ready,” the battery may have been disconnected or codes may have been recently cleared. That does not prove dishonesty, but it means the vehicle may need more driving before hidden faults reappear.

Is the Buick Encore a Bad Vehicle?

The Buick Encore is not automatically a bad vehicle, but it is not a crossover we should buy blindly.

Its strengths include:

• Easy urban manoeuvrability
• Comfortable seating position
• Quiet cabin for its size
• Useful hatchback layout
• Available all-wheel drive
• Generally straightforward controls

Its weaknesses include:

• Limited power
• Turbo-system complexity
• PCV-related vulnerabilities
• Potential cooling and oil leaks
• Tight engine-bay packaging
• Repair costs that can feel high relative to the vehicle’s value

The Encore makes the most sense when it has strong maintenance records, no active warning lights, stable coolant and oil levels, and a clean diagnostic inspection.

Final Thoughts on Buick Encore Engine Problems

Buick Encore engine problems rarely exist in neat little boxes. A failed PCV component may create an oil leak. The oil leak may lower the engine level. Low oil may damage the turbocharger. A turbo problem may trigger reduced power. Suddenly, what began as a faint whistle becomes a four-figure repair.

That chain reaction is why early diagnosis matters.

The most important areas to watch are the turbocharger system, wastegate operation, PCV passages, valve cover, intake plumbing, ignition system, cooling components, and oil level. Cold-climate owners should also remain aware of charge-air-cooler and PCV icing concerns affecting certain 1.4-liter vehicles.

We should approach every warning light with curiosity rather than panic. Read the codes, inspect the basics, test the system, and demand evidence before replacing expensive parts. With consistent maintenance and prompt repairs, many Buick Encores can remain practical, comfortable daily drivers instead of becoming permanent residents of the repair shop.

Frequently Asked Questions

1. What is the most common Buick Encore engine problem?

PCV-system faults, valve-cover issues, oil leaks, and turbo underboost are among the most commonly discussed problems on first-generation 1.4-liter models. The exact cause must be confirmed through crankcase-pressure, vacuum, and boost testing.

2. Why does my Buick Encore say reduced engine power?

The engine computer has detected a fault and is limiting performance. Causes may include turbo underboost, throttle or sensor problems, misfires, overheating, wiring faults, or PCV-system issues.

3. Does a P0299 code mean the turbocharger is bad?

Not necessarily. P0299 indicates insufficient boost pressure, but the cause may be a boost leak, wastegate problem, control solenoid, sensor fault, PCV issue, icing condition, or damaged turbocharger.

4. Why is my Buick Encore leaking oil around the valve cover?

The gasket or cover may be damaged, but excessive crankcase pressure from a restricted PCV system can also force oil through the seal. The PCV system should be tested before treating the leak as a simple gasket failure.

5. Is it worth repairing a Buick Encore engine?

It depends on the vehicle’s age, mileage, condition, repair cost, and market value. A moderate repair may be worthwhile on a well-maintained vehicle, while turbo, timing, or complete-engine work may not make financial sense on a severely neglected high-mileage example.

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