2020 Audi A6 — Should You Buy One?
Typical asking price: $23,000–$33,000. There are 5 high-severity known issues you need to know before handing over a check.
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Kestrel Take
Twenty-five complaints is a thin record — far thinner than the 2019's — and thin means few people filed, not that the car is sorted. Nine recall campaigns on one model year is the number that should shape your afternoon: a starter generator that can short and burn, a rear axle lock nut that can break, a fuel sender that can let the car run dry, an airbag that may not come through the dash properly. None of that costs you anything if the work was done, and all of it is checkable in two minutes on the NHTSA VIN lookup. What owners actually paid for on this year is water: leaks into the passenger floor that corrode wiring and grow mould. Pull the carpet up before you pull your wallet out.
What we checked
Reconciled against public records, 2026-09-25
NHTSA holds 25 owner complaints for the 2020 Audi A6, and 9 recall campaigns.
A big number here usually means a lot of these were sold, not that it is a bad vehicle — popular models collect more complaints for the same rate of trouble. So the total on its own says little. What is worth reading is the shape of it. 68% of them are about one thing — electrics and electronics. That much concentration is a genuine pattern rather than background noise, and it is the first thing to check on any example you look at.
9 recall campaigns cover this model year. Recalls are repaired free, for any owner, with no time limit on most safety campaigns — but only if someone books it in. Ask the seller to show it was done, or have any dealer check the VIN; it takes them a couple of minutes and costs nothing.
Counts come from the NHTSA complaint and recall database — free, public, and worth checking yourself.
Known Issues for the 2020 Audi A6
Ranked by wallet impact. These are documented, recurring problems — not freak accidents. How we decide that.
The most expensive thing owners report on this year. Water enters through a leaking seam in the body structure on the passenger side, soaks the carpet and seat rails, and corrodes the front passenger seat harness and nearby control modules — one owner reports black mould growing in the carpet and an electrical connector, another reports the intrusion reducing acceleration through a wet module. Camera dropouts show up in the same cluster, with a dealer scan finding a faulty rear environmental camera and several sporadic faults. Two of the three structure complaints are also water pooling in the rear passenger footwell. Press the carpet hard with your palm in all four footwells, lift the mats, and put your nose near the sills.
Repair cost (estimate): $1,500–$5,000 depending on how much harness and how many modules are wet
Source: NHTSA complaints filed under electrics and electronics (17), the body and structure (3).
Owners describe the automatic emergency braking firing at highway speed with nothing in front of the car — one at 80 mph in an HOV lane, one that came to a complete stop and jolted passengers — and Emergency Assist deciding the driver is unresponsive, slowing the car in traffic and in one report steering toward an adjacent lane. The systems are also reported as simply not working at other times. One owner was told realignment of the sensing system would cost around $4,000 and refused because the car was under warranty. Drive it on a road with oncoming traffic and a car following at a safe distance, and see whether the car brakes itself.
Repair cost: Not yet priced — a safety matter first, a repair bill second
Source: NHTSA complaints filed under the driver-assist and automatic braking systems (5).
Recall 20V153 covers 2019–2020 A6 cars with the 2.0 TFSI mild-hybrid setup: moisture can get into the starter generator and short it out, which is a fire risk. The dealer replaces the unit free of charge. This is the same unit whose failure dominates the 2019 A6's complaint record, and this year's 'electrical system malfunction, car will not run' filing reads the same way — the difference between the two years is how many owners filed, not a different part. Confirm the campaign is closed on the VIN before anything else.
Repair cost: $0 with the recall — verify it was performed; $2,200–$4,500 to replace one out of warranty
Source: 9 NHTSA recall campaigns on this model year.
Recall 21V295 covers a rear axle lock nut that can break and misalign the rear axle, which can cost the driver control of the car. Recall 22V034 is the follow-on: that same misalignment chews tires unevenly, so dealers inspect the axle, realign it and replace worn tires at no cost. Both are free, and both are worth confirming because a car that had the nut replaced but never the alignment can still be eating a set of rear tires. Look at the inside shoulders of both rear tires for feathering, and take a car that tramlines or crabs straight to an alignment rack.
Repair cost: $0 with the recall — verify it was performed; $150–$250 for a four-wheel alignment afterwards
Source: 9 NHTSA recall campaigns on this model year.
Recall 22V861 covers liquid spilled in the rear seat reaching the gateway control module below it and shutting it down, which suddenly reduces engine power; the free fix is a protective cover. Recall 22V155 covers a fuel level sender that can stick and show fuel the tank does not have, so the engine stalls from running dry. On a car that already has a documented habit of getting wet inside, the gateway one deserves particular attention — check under the rear seat cushion as well as the carpet, and watch the fuel gauge move on the test drive.
Repair cost: $0 with the recall — verify it was performed
Source: 9 NHTSA recall campaigns on this model year.
Recall 20V274 is specific to the 2020 A6, A6 Allroad and A7: the passenger airbag may not deploy correctly through the instrument panel tear seam and can throw small plastic parts into the cabin, and the remedy is a new instrument panel — a big job the dealer does free. Recall 21V159 then covers the score line on the airbag itself. Neither is visible or testable from the passenger seat; both are a VIN lookup. If the dash was replaced under the first campaign, ask to see the paperwork, because a badly refitted dash is where rattles and squeaks come from.
Repair cost: $0 with the recall — verify it was performed
Source: 9 NHTSA recall campaigns on this model year.
Recall 25V900 covers a software error that can stop the rearview camera image appearing, which fails a federal safety standard and also matches what owners report about the 360-degree cameras going black after a cold start. Recall 23V601 covers an incorrectly labelled brake fluid reservoir cap that could lead a shop to put the wrong fluid in and reduce braking performance. If the car has had a brake fluid service, tell your inspector about that campaign and have the fluid tested rather than assumed.
Repair cost: $0 with the recall — verify it was performed; $150–$300 for a brake fluid flush if the wrong type went in
Source: 9 NHTSA recall campaigns on this model year.
Walk-Away Red Flags
- ✗Damp carpet or a musty smell in any footwell, especially the front passenger side
- ✗Any camera view that comes up black or with a cancel symbol
- ✗The car braking itself with nothing ahead, or an Emergency Assist takeover warning
- ✗Feathered or uneven wear on the inside edges of the rear tires
- ✗Rattles from behind the dashboard on a rough road — a sign the panel has been apart
Good Signs
- ✓All nine campaigns shown closed on the NHTSA VIN lookup
- ✓Starter generator replaced under recall 20V153, with the invoice
- ✓Dry carpet under the front passenger seat with the trim lifted
- ✓Rear axle alignment sheet from the 22V034 inspection
- ✓A full set of matched tires with even wear across both rear shoulders
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Known issues on this page are based on documented owner reports, NHTSA complaints, class-action records, and manufacturer technical service bulletins. Individual vehicles vary. A pre-purchase inspection by a trusted mechanic is always worth doing.
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