EngineHigh
FA20 turbo ringland/bearing failure if abused or over-tuned.
- Typically appears
- Any
- What to inspect
- Check for tuning, do a compression/leakdown test if possible.
2015–2021 Subaru WRX · common problems & known faults
The WRX is a turbocharged performance icon. Many have been driven hard, so mechanical checks are essential.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed July 2026
Quick answer
The most commonly reported faults on the 2015–2021 Subaru WRX are FA20 turbo ringland/bearing failure if abused or over-tuned, Clunking noise from behind the dashboard during acceleration caused by the pitch stop mount tearing away from the firewall and 6-speed manual clutch wear and gearbox notchiness. 2 of the documented issues are rated high severity · inspect these first. Full inspection points, onset mileage and what to check are listed below.
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Build the inspection planReliability snapshot
Based on the documented faults on this page for the Subaru WRX.
4.5/ 10
- Critical
- 0
- High
- 2
- Medium
- 6
- Low
- 0
Guidance only · reflects reported patterns, not a specific car's condition.
Known faults to check
TransmissionMedium
6-speed manual clutch wear and gearbox notchiness.
- Typically appears
- Any
- What to inspect
- Test clutch bite point and shift feel; watch for launch abuse.
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Build the inspection planSuspensionMedium
Worn bushings and struts from hard driving.
- Typically appears
- 50,000+ miles
- What to inspect
- Check for clunks and uneven tyre wear.
CoolingMedium
Turbo oil-feed and cooling issues on tracked cars.
- Typically appears
- Any
- What to inspect
- Check for coolant/oil leaks and service history.
Engine / IntakeMedium
Rough idle, hesitation, and cold start misfires due to severe carbon build-up on the intake valves.
- Typically appears
- 40,000-60,000 miles
- What to inspect
- Start the engine from dead cold. Watch the rev counter for erratic hunting and listen at the exhaust tailpipes for intermittent popping or misfires during the initial warm-up cycle.
Chassis / BodyHigh
Clunking noise from behind the dashboard during acceleration caused by the pitch stop mount tearing away from the firewall.
- Typically appears
- 30,000-70,000 miles (especially 2015-2017 models)
- What to inspect
- Open the bonnet and locate the pitch stop mount beneath the top-mount intercooler. Shine a torch on the firewall bracket to check for cracked factory welds or torn metal.
HVACMedium
Air conditioning blows warm or emits a loud squealing noise due to premature A/C compressor magnetic clutch failure.
- Typically appears
- 50,000-80,000 miles
- What to inspect
- Start the engine, set the A/C to maximum cold, and observe the compressor pulley at the front of the engine. Check if the clutch engages smoothly or rapidly cycles on and off.
Engine / Forced InductionMedium
Hissing noise under load and sluggish acceleration caused by the factory plastic charge pipe cracking and leaking boost.
- Typically appears
- 50,000-70,000 miles
- What to inspect
- Visually examine the plastic charge pipe routing to the intercooler for hairline cracks. Blip the throttle manually and listen closely for escaping air around the pipe joints and bypass valve.
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Build my inspection planFrequently asked questions
Is the Subaru WRX reliable?
When stock and well-maintained, yes — but modified or abused cars can suffer expensive engine damage.
Does the WRX have engine problems?
Ringland and bearing failures occur on tuned or hard-driven FA20 engines.
What should I check on a used WRX?
Signs of tuning/abuse, clutch health, engine compression and suspension.
Does the FA20DIT engine require premium unleaded fuel?
Yes, the FA20DIT is highly sensitive to fuel quality due to its high compression ratio and turbocharger. It requires a minimum of 97 RON super unleaded, though 99 RON is strongly recommended. Using standard 95 RON fuel causes the ECU to pull ignition timing, resulting in sluggish performance and risking detonation.
How often should the CVT fluid be changed on automatic models?
Although Subaru occasionally markets the Lineartronic CVT as sealed for life, UK specialists strongly advise replacing the CVT fluid and filter every 40,000 miles. Degraded fluid leads to valve body failure, chain slip, and juddering during acceleration. Regular fluid changes are critical to preventing catastrophic gearbox failure.
Are aftermarket modifications a red flag for forecourt stock?
Yes, aftermarket modifications require careful scrutiny. The FA20DIT engine management is highly sensitive to changes in airflow. If the vehicle features an aftermarket intake, downpipe, or blow-off valve without a corresponding ECU remap, it will run lean and risk severe internal damage. Always verify modified cars have appropriate tuning documentation.
Sources & further reading
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.
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