Credov's researched list of the 2 faults the Subaru WRX STI Premium is known for (2014–2021), 1 of them serious or costly. Each one says what to look for when you check the car, so you can spot it before you buy. Not every car has these faults: they are the ones worth checking on this model.
What to look for: On a gentle full-throttle pull from 2,500-3,500 rpm, feel for a stumble or misfire.
Why it matters: Ringland failure remains the most-feared engine failure on this platform, and a tuned or low-octane history raises the odds sharply; confirming the fuel and tuning history, and the engine's response under load, is worth doing before buying.
What to look for: Check the bonnet leading edge, front bumper and lower rear doors ahead of the rear wheels for chips and touch-up dots.
Why it matters: A chip left untreated on a steel door rusts, which is a far more expensive repair than a stone chip caught early, and heavy chipping can make a genuinely low-km car look overused to a future buyer.
Got a question about a Subaru WRX STI Premium? Ask Credov: a noise, a warning light, a part or how to fix it.
On top of the faults above, every Credov inspection covers the basics: fuel smell, leaks or filler rust, engine oil leaks, power steering fluid leak, drive belt cracks or squeal, rust underneath: chassis and mounts, engine mounts, engine oil level and colour, coolant level, colour and leaks, head gasket failure signs, cold start: rattle, knock or smoke, rough or hunting idle, engine running hot on gauge, gearbox or diff oil leak, swapped gearbox without lvv and more.
Researched by Credov from manufacturer recalls and service bulletins, owner reports and workshop sources. Repair prices are typical ranges, not quotes. See also fault codes and repair costs.