Credov's researched list of the 2 faults the BMW M4 is known for (2014–2020), 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: Smell for petrol around the rear of the car, and look underneath for damp or staining near the tank.
Why it matters: A leaking tank near a hot exhaust is a fire risk; typically NZ$3,000-$6,500 for a new tank.
What to look for: Ask for proof of a pinned or keyed crank hub, and check the scan for cam or crank timing codes.
Why it matters: If the hub slips the valves can hit the pistons, which usually means a rebuilt or replaced engine. A tuned car without a pinned hub carries that risk, so price it in or ask for the upgrade first.
Got a question about a BMW M4? 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.