Credov's researched list of the 3 faults the Audi A4 (B8) 3.0 TFSI is known for (2011–2015), 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 and look for fuel stains on top of the warm engine, and ask if the recall was done.
Why it matters: Australian recall PRA 2015/14530: a leak at the fuel rail / injector connection in the presence of an ignition source is a fire hazard.
Sources: 1
What to look for: Smell for petrol in the cabin and engine bay at idle, and ask if the fuel rail recall was done.
Why it matters: Australian recall PRA 2019/17395 (March 2019): fuel may escape from one or both low-pressure fuel rails; fire hazard.
Sources: 1
What to look for: Listen at first cold start for a rattle from the back of the engine, noting if it lasts over 3 seconds.
Why it matters: Audi TSB 15 16 28 2039995/2 (27 Apr 2016) covers 2011-15 MY B8 A4 and C7 A6 and 2013-15 MY 8R Q5 with the 3.0 TFSI for this noise and specifies replacing both bank upper chain tensioners (06E109218AJ / 06E109217AH); the bulletin states the noise did not lead to damage.
Sources: 1
Got a question about a Audi A4 (B8) 3.0 TFSI? 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.