Every Subaru problem, by model and severity
Real failures, root causes, repair costs, and DIY difficulty — sourced from NHTSA filings, Subaru TSBs, class-action settlements, and forum data. Updated continuously.
WRX / STI
15 known issuesEJ255/EJ257 Ringland Failure
Detonation cracks the second piston ringland, destroying the engine — common in tuned 2008-2014 WRX/STI.
EJ257 Rod Bearing Failure
STI rod bearings spin under sustained high RPM — often catastrophic and without warning.
2022+ WRX FA24 RTV Oil Pickup Clog
Excess factory RTV sealant breaks loose and clogs the oil pickup screen — engine starvation.
WRX STI Rod Knock / Spun Bearing (EJ257)
Catastrophic engine failure on EJ257 engines, commonly referred to as "rod knock," is typically caused by a spun connecting rod bearing leading to severe damage.
Subaru WRX STI Rod Knock and Low Oil Pressure Issues (2008-2014)
The 2008-2014 Subaru WRX STI is prone to catastrophic engine failure caused by rod bearing starvation, often stemming from oil pickup tube failure or oil thinning under high load.
Subaru WRX Turbo Banjo Bolt Screen Oil Starvation
A small mesh screen inside the turbo oil feed line banjo bolt clogs with sludge, causing catastrophic turbocharger failure and potential engine destruction.
WRX FA20 Bent Connecting Rod
Knock control limited by ECU on lower-octane fuel; rod bends, then catastrophic failure.
5MT Gear Grinding (3rd Gear)
Many 2002-2014 Subaru WRX models with the 5-speed manual transmission experience a "grinding" or "crunching" sensation when shifting into 3rd gear, particularly during spirited driving.
Boost Leak from Y-Pipe
A common issue on 2002-2014 WRX models where the turbocharger Y-pipe’s rubber coupler cracks or loosens, leading to a loss of boost pressure and reduced engine performance.
DCCD Controller Failure (STI)
The Subaru WRX STI's Driver's Control Center Differential (DCCD) controller can fail, leading to a loss of all-wheel-drive control and potentially dangerous driving conditions.
Window Regulator Failure
The window regulator assembly in 2008-2014 Subaru WRX models can fail, often due to a broken plastic clip, leading to inoperable windows.
Subaru WRX TGV Motor Failure & Diagnostic Trouble Codes
The 2008-2014 Subaru WRX often experiences TGV (Tumble Generator Valve) motor failure, triggering a Check Engine Light and forcing the vehicle into a restricted performance 'Limp Mode'.
WRX Rear Subframe Rust
Rust-belt subframes corrode; structural integrity loss.
Subaru WRX Cold Start Clutch Chatter and Shudder
The 2015-2021 Subaru WRX often experiences violent vibrations or 'chatter' during the first few gear engagements when the vehicle is cold.
WRX TMIC Heat Soak Power Loss
Stock top-mount intercooler heat soaks in traffic, cutting power.
Legacy
10 known issuesLegacy GT Turbo Failure
VF40/VF46 turbos on 2005-2009 Legacy GT fail by 100k miles from oil starvation.
Subaru Legacy GT EJ255 Turbocharger Lubrication Failure
The 2005-2009 Subaru Legacy GT is prone to premature turbocharger failure caused by clogged banjo bolt oil filters, often resulting in total engine destruction.
CVT Valve Body Failure
The continuously variable transmission (CVT) valve body in 2010-2018 Subaru Legacy models can fail, leading to significant drivability issues and potential transmission replacement.
EJ25 Head Gasket Failure (2000-2009 Legacy)
Head gasket failures on EJ25 engines in the 2000-2009 Subaru Legacy can lead to external oil/coolant leaks or internal coolant/combustion gas mixing.
Legacy Power Steering Rack Leak
Power steering rack leaks are common on 2005-2014 Subaru Legacy models, often leading to a loss of power steering assist if not addressed.
Turbocharger Failure
The OE turbocharger on 2005-2009 Subaru Legacy GT models can fail prematurely, often due to oil starvation from a clogged banjo bolt filter.
Subaru Legacy AC Compressor Failure & Clutch Issues
The 2010-2019 Subaru Legacy frequently suffers from AC compressor seizure or magnetic clutch failure, leading to a complete loss of cabin cooling and potential engine stalling.
Subaru Legacy CVT Torque Converter Shudder & Stalling
A low-speed vibration or 'rumble strip' sensation during acceleration and decelaration caused by improper lock-up clutch engagement in the Lineartronic CVT.
Legacy CVT Judder
Torque-converter shudder at 25-45 mph cruise.
Legacy Rear Wheel Bearing Failure
Rear bearings howl above 40 mph, often by 80k miles.
BRZ
8 known issuesFA20 Valve Spring Recall
Defective valve springs in 2012-2013 BRZs can fracture, dropping a valve and destroying the engine.
Valve Spring Recall (FA20)
The FA20 engine in early BRZ/FRS models experienced a recall due to faulty valve springs that could lead to engine damage.
Subaru BRZ Fuel Pump Seizure & Denso Recall Guide
The Subaru BRZ is part of a massive global recall involving defective Denso fuel pumps that can swell and seize, causing sudden engine stalling while driving.
2013-2014 Subaru BRZ FA20 Valve Spring Recall (WTY-84)
A major safety recall affecting 2013-2014 BRZ models where defective valve springs can fracture, causing the engine to stall unexpectedly or suffer catastrophic internal damage.
BRZ Fuel Pump Failure (Denso)
Impeller swells, pump seizes, engine stalls.
Fuel Pump Failure (Denso)
Denso low-pressure fuel pumps in 2013-2020 Subaru BRZ models can fail prematurely, leading to a range of fuel delivery issues and potential stalling.
BRZ Clutch Chatter & Judder
Aisin clutch judders from a stop, typically after 60k miles.
Subaru BRZ Infotainment Bluetooth Disconnect & Freezing
The 2017-2020 Subaru BRZ Starlink infotainment system frequently drops Bluetooth connections or freezes during media playback and call synchronization.
Forester
15 known issuesSubaru Forester XT Turbo Banjo Bolt Filter Failure (2004-2013)
A small mesh screen inside the turbo oil feed line banjo bolt clogs with sludge, leading to total turbocharger failure and potential engine destruction.
FB25 Excessive Oil Consumption
2011-2015 Foresters burn 1 quart per 1,000 miles — class-action settlement covers ring replacement.
Rear Differential Whine
Owners of 2010-2018 Subaru Foresters may experience a noticeable whining noise coming from the rear of the vehicle, often indicating an issue with the rear differential.
Forester XT Turbo Failure
Catastrophic turbocharger failure in EJ255-equipped Forester XTs due to oil starvation from a clogged banjo bolt filter.
Knock Sensor Failure (P0328)
A P0328 trouble code indicates a high input from the knock sensor, often leading to reduced engine performance and fuel economy in Subaru Forester models.
Subaru Forester Rear Suspension Knuckle Bushing Failure
2014-2022 Subaru Foresters frequently experience premature failure of the rear knuckle bushings, leading to clunking noises and unstable high-speed handling.
Subaru Forester Sunroof Drain Blockage and Cabin Leaks
Debris accumulation in the moonroof drainage channels leads to water intrusion into the cabin, potentially damaging electrical systems and causing mold.
Subaru Forester Catalytic Converter Theft & Exhaust Damage
Subaru Foresters (2014-2022) are high-frequency targets for catalytic converter theft due to their accessible ride height and valuable PZEV-grade precious metals.
Forester Rear Differential Whine
Rear differential pinion bearing wear causes 40-65 mph whine.
Forester Spontaneous Windshield Cracks
Heated wiper deicer area triggers stress cracks at low ambient temps.
Forester CVT Shudder & Judder
Shudder during light acceleration from 25-45 mph, often after fluid degrades.
Forester Rear Differential Whine
Pinion bearing whines under load; metal in fluid.
Forester Windshield Cracking
2019+ Foresters develop spontaneous windshield cracks from the EyeSight bracket area.
Sunroof Drain Clog and Water Leak
Clogged sunroof drains can cause water to leak into the cabin, leading to potential electrical issues and interior damage in 2014-2019 Subaru Foresters.
Subaru Forester Front Grille Emblem Peeling and Delamination
The front grille 'Six Stars' emblem on 2014-2020 Foresters frequently suffers from delamination where the blue backing peels or bubbles away from the clear acrylic cover.
Ascent
9 known issuesSubaru Ascent CVT Transmission Shudder & Chain Slip Guide
The Subaru Ascent (2019-2022) frequently experiences a violent 'shudder' or 'judder' caused by CVT chain slip, often leading to total transmission failure.
Ascent FA24 PCV Valve Failure
Stuck-open PCV valve dumps oil into the intake — early Ascents (2019-2020) were recalled.
Coolant Leak from RTV Sealant
Some 2019-2021 Ascent vehicles may develop an external coolant leak from improperly applied RTV sealant at the timing chain cover.
PCV Valve Failure (FA24)
The PCV valve on early FA24 engines can fail, leading to oil consumption, rough idle, and potentially turbocharger damage.
Subaru Ascent PCV Valve Failure and Excessive Oil Consumption
Owners of 2019-2024 Subaru Ascents report excessive oil consumption and blue smoke caused by a faulty PCV valve drawing oil into the FA24F turbo engine's intake tract.
Subaru Ascent Third-Row Seat Latch Failure Guide
Subaru Ascent owners report that the third-row seat backs fail to lock into the upright position, posing a significant safety risk to passengers.
Ascent PCV Valve Oil Leak
PCV valve seat fails, dumps oil into intake and engine bay.
Ascent Side Mirror Detaches
Adhesive holding mirror glass to backing fails at temperature extremes.
Ascent Windshield Spontaneous Cracking
Stress cracks form from base of windshield without impact.
Impreza
8 known issuesSubaru Impreza CVT Chain Stretch and Transmission Slipping
A critical failure where the internal metal drive chain of the Lineartronic CVT stretches or slips, leading to total transmission failure in 2017-2024 Subaru Imprezas.
FB20 Impreza Oil Consumption
Same low-tension ring issue as the Forester FB25 — affects 2012-2016 Imprezas.
FB20 Oil Consumption
Excessive oil consumption in Subaru FB20 engines can lead to low oil levels, engine damage, and potential breakdowns if not properly monitored and addressed.
Wheel Speed Sensor Failure
The ABS wheel speed sensor on 2012-2019 Subaru Impreza models can fail prematurely, leading to a host of warning lights and a disabled ABS system.
Subaru Impreza Premature Wheel Bearing Failure Guides (2017-2024)
The 5th and 6th generation Subaru Impreza models frequently experience premature rear wheel bearing failure, characterized by a loud humming or growling noise as early as 30,000 miles.
Impreza CVT Shudder
Same TC shudder pattern as Legacy/Outback CVTs.
Impreza Low-Pressure Fuel Pump Failure
Pump impeller cracks, causing no-start or stalling.
Subaru Impreza Clear Coat Peeling & Paint Failure (2012-2016)
The 2012-2016 Subaru Impreza often suffers from premature clear coat failure, resulting in unsightly white oxidation and peeling patches on horizontal surfaces.
Outback
15 known issuesEJ25 SOHC Head Gasket Failure
Subaru's most famous defect — external coolant/oil leaks from the head gasket on 1999-2009 2.5L.
Lineartronic CVT Shudder & Failure
Torque-converter shudder at 30-45 mph and chain-belt failures plagued 2010-2018 CVTs.
Catalytic Converter Failure (P0420)
Catalytic converter failure, commonly indicated by a P0420 check engine light, reduces engine performance and increases emissions due to an inefficient or damaged catalytic converter.
CVT Shudder and Failure
Owners of 2010-2018 Subaru Outbacks may experience continuous variable transmission (CVT) shuddering, hesitation, or complete failure, often stemming from fluid degradation or internal wear.
Excessive Oil Consumption
Subaru Outback vehicles (2011-2015) with the FB25 engine may experience excessive oil consumption due to faulty piston rings, leading to premature engine wear and potential damage if ignored.
Head Gasket Failure
Head gasket failure on 2000-2009 Subaru Outback models often leads to external oil or coolant leaks, misfires, or overheating due to compromised cylinder sealing.
Subaru Outback DPF Regeneration Failure & Clogging
The 2010-2015 Subaru Outback Diesel (EE20 engine) frequently suffers from DPF clogging due to incomplete regeneration cycles, leading to 'Limp Mode' and potential engine damage.
Subaru Outback Melting and Cracking Dashboard (2010-2014)
Owners of 2010-2014 Subaru Outbacks report dashboards becoming sticky, shiny, and developing deep cracks or 'melting' appearances due to UV degradation.
Subaru Outback Windshield Cracking & EyeSight Issues
2015-2024 Subaru Outbacks frequently suffer from spontaneous windshield cracking or extreme fragility due to thin acoustic glass and structural tension.
Subaru Outback Rear Differential Whine & Bearing Failure
Owners of 2015-2022 Subaru Outbacks often report a high-pitched metallic whining or humming noise from the rear of the vehicle, typically signifying premature rear differential bearing failure.
Subaru Outback EyeSight Calibration Drift & Sensor Failure
Subaru Outback EyeSight systems from 2015-2024 can experience operational failure or 'drift' requiring professional recalibration due to windshield changes or sensor misalignment.
Outback Windshield Wind Noise
A-pillar molding gaps allow wind whistle above 55 mph; dealer fix is reseat + foam.
Outback 11.6" Screen Black-Out
Center screen reboots or stays black on cold start.
Outback PCV Valve Oil Leak
Plastic PCV valve cracks, causing oil seepage and rough idle.
Outback HVAC Mold & Musty Smell
Damp evaporator core breeds mold; dirty sock smell on AC startup.
Crosstrek
12 known issuesCrosstrek CVT Judder
2013-2017 Crosstreks share the Outback's torque-converter shudder issue.
AC Compressor Failure
The AC compressor in 2013-2019 Crosstreks can fail prematurely, leading to a loss of cold air from the ventilation system.
Battery Drain / Parasitic Draw
Starlink-equipped Subaru Crosstrek models may experience a dead battery due to a parasitic draw, often traced back to the DCM (Data Communication Module).
Crosstrek Cracked Windshields
Many 2017-2022 Subaru Crosstrek owners report their windshields cracking or spontaneously shattering, often without any impact.
CVT Hesitation Off the Line
Some 2013-2018 Subaru Crosstrek models with Continuously Variable Transmissions (CVTs) may experience a noticeable hesitation or lag when accelerating from a stop.
Wheel Bearing Failure
Worn wheel bearings can lead to noise, vibration, and potentially dangerous wheel detachment if not addressed in a timely manner.
Subaru Crosstrek Parasitic Battery Drain & Starting Issues
Second-generation Subaru Crosstreks frequently suffer from dead batteries due to an undersized factory battery and parasitic power consumption from the Starlink telematics system.
Subaru Crosstrek Cold Start Stalling & Rough Idle (2013-2017)
First-generation Subaru Crosstrek models often experience engine stalling immediately after a cold start or when coming to a stop during the engine warm-up phase due to carbon-clogged throttle bodies and outdated ECM software.
Subaru Crosstrek Rear Hatch Strut Pressure Loss
The rear liftgate struts on 2013-2022 Subaru Crosstreks frequently lose pressure, causing the heavy hatch to drop unexpectedly or fail to stay open.
Subaru Crosstrek Hill-Start Assist False Alarm & Warning Light
A frequent 'Hill Start Assist Disabled' warning on 2018-2024 Crosstreks is typically triggered by a faulty or misaligned brake light switch rather than a mechanical failure in the braking system.
Crosstrek EyeSight Deactivates
Stereo cameras deactivate when windshield gets road glare or temp swings.
Crosstrek Starlink Infotainment Random Reboot
Touchscreen reboots mid-drive, loses CarPlay/Android Auto pairing.