Used car guide

2019 Audi S6 TDI Quattro Auto: common problems and what to check

What gets flagged at MOT on 2019 Audi S6 TDI Quattro Autos, from 100 tests in 2025, plus known faults and what to look at before you buy one.

Small sample: only 100 of these were MOT tested in 2025, so treat the percentages as rough. The known faults below don't depend on it.

100MOT tests in 2025
96%pass first time (all 2019 cars: 84%)
9,500typical miles a year
17%had tyres flagged

What gets flagged at MOT

The share of 2019 Audi S6 TDI Quattro Auto MOT tests where testers flagged each area, as a fail or an advisory. Rough prices are typical independent-garage costs.

  • Tyres
    17% 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.

  • Brakes
    5% 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.

  • Seats and seatbelts
    2% of testsRough price £80–£250

    At the viewing: Pull each seatbelt sharply. It should lock, and retract cleanly.

  • Suspension
    2% 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 mirrors
    2% of testsRough price £15–£250

    At the viewing: Check for chips in the driver's view, and test the wipers and washers.

  • Lights and electrics
    2% of testsRough price £10–£80

    At the viewing: Ask a friend to check every light, including brake lights and indicators, while you operate them.

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.

  • Electrical and infotainment faults
    All engines

    It came last of 24 executive cars in What Car?'s survey: 44% had a fault, about two-thirds electrical or infotainment (phones not connecting, flickering screens), and nearly half took over a week to fix.

    At the viewing: Connect your phone, use the screens, and check every electrical item.

    Source: What Car?: used Audi A6 (2018 on) reliability

  • Rattles and trim buzzes
    All engines

    Rattling parcel shelves and buzzing trim are reported.

    At the viewing: Drive on a rough road and listen.

    Source: What Car?: used Audi A6 (2018 on) reliability

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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 2019 Audi S6 TDI Quattro Autos registered in 2019. "Flagged" includes advisories, so it isn't the same as a fail rate. How we score