Credov's researched list of the 2 faults the Ford Focus-ST3 is known for (2012–2018), 2 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: Listen for an uneven idle or a misfire under light load, and check for blue or white exhaust smoke.
Why it matters: A cracked piston or ring land usually shows as low or zero compression on one cylinder and the fix reported is a short block, a used engine or a forged-piston rebuild, all major jobs.
What to look for: With the gearbox warm, make brisk 1-2 and 2-3 changes and listen and feel for grinding or baulking.
Why it matters: Worn synchros get progressively worse and a full repair means opening the gearbox, which is a costly manual-transmission job.
Got a question about a Ford Focus-ST3? 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.