2020 Audi A4 Allroad Sport 40TDI Quat SA: common problems and what to check
What gets flagged at MOT on 2020 Audi A4 Allroad Sport 40TDI Quat SAs, from 146 tests in 2025, plus known faults and what to look at before you buy one.
Small sample: only 146 of these were MOT tested in 2025, so treat the percentages as rough. The known faults below don't depend on it.
What gets flagged at MOT
The share of 2020 Audi A4 Allroad Sport 40TDI Quat SA MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.
- Tyres21% of testsRough price £70–£150
At the viewing: Check the tread on all four tyres, including the inside edges, and look for cracks or bulges.
- Brakes14% of testsRough price £150–£350
At the viewing: Look for a lip on the disc edges and feel for judder or pulling when braking firmly from about 40mph.
- Suspension9% of testsRough price £120–£400
At the viewing: Listen for knocks over speed bumps, and look behind each front wheel for a snapped coil spring.
- Wipers, windscreen and mirrors5% of testsRough price £15–£250
At the viewing: Check for chips in the driver's view, and test the wipers and washers.
- Lights and electrics2% of testsRough price £10–£80
At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.
- Oil and fluid leaks1% of testsRough price £80–£600
At the viewing: Look under the engine and on the ground where the car is usually parked for fresh oil or fluid.
Known faults
Reported by owners, mechanics and buying guides for this model and age. Check which engine the car has, as some apply to one engine only.
- Starter-alternator recall (mild hybrids)Mild-hybrid models
Moisture could get into the starter-alternator on mild-hybrid cars, which led to two recalls in 2020.
At the viewing: Ask an Audi dealer or the seller to confirm the recall work was done.
- Seat and airbag recallsAll engines
There were recalls for front seats and seat frames, and for airbags and seatbelt pre-tensioners that might not work.
At the viewing: Make sure the airbag light goes out, and ask for proof of recall work.
- Stop-start problemsAll engines
Some owners report problems with the stop-start system.
At the viewing: Watch the engine stop and restart smoothly at junctions, with no warning lights.
- Trim rattlesAll engines
Rattles from the cabin trim are a common complaint.
At the viewing: Drive on a rough road and listen around the dashboard and doors.
- Powered tailgate faults (Avant)Avant estate
The powered tailgate on Avant estates can play up.
At the viewing: Open and close it several times with the button and the key.
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Where this comes from: the DVSA's anonymised results for every MOT test in Great Britain in 2025, counting tests of 2020 Audi A4 Allroad Sport 40TDI Quat SAs registered in 2020. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score