Head-to-head reliability
AUDI A4 vs AUDI A6
How the AUDI A4 and AUDI A6 compare on NHTSA complaints, recalls and crash reports — and which is the lower-risk used buy.
Based on NHTSA owner-complaint & recall records
AUDI A4 vs AUDI A6: The A4 averages 29.7 complaints per year and has 14 recalls, while the A6 averages 20 complaints per year but 41 recalls. Both show electrical issues as the top complaint. The A6 has more safety-related recalls, so verify all fixes. Source: NHTSA owner complaints.
The picture
Is the AUDI A4 or AUDI A6 more reliable?
A plain-English read on what the NHTSA record says about living with each vehicle.
AUDI A4
The Audi A4 is a compact luxury sedan that averages about 30 complaints per year over the past decade, with 14 recalls. The most common owner-reported trouble spots are electrical gremlins, transmission shuddering, and backup camera failures. While it has fewer recalls than the A6, the A4 still demands attention to electronics and drivetrain behavior before you buy.
AUDI A6
The Audi A6 is a midsize luxury sedan that averages 20 complaints per year but carries a much higher recall count—41 over ten years. Owners frequently report electrical failures, sudden engine power loss, and forward collision warning malfunctions. The A6's higher recall volume suggests more widespread safety-related fixes, so verifying recall completion is critical.
The numbers
Side-by-side NHTSA record
Lower is better in every category. The highlighted cell is the stronger result.
| Category | AUDI A4 | AUDI A6 |
|---|---|---|
| Total complaintsAll model years combined | 297 | 200 Better |
| Safety recallsFederal recall campaigns | 14 Better | 41 |
| Crash reportsCrash-related complaints | 10 | 2 Better |
| Complaints per yearAveraged across model years | 29.7 | 20.0 Better |
| Reported injuriesTied to owner complaints | 4 | 2 Better |
Source: NHTSA owner complaints & recall records.
What actually goes wrong
The problems owners report
The most-complained-about systems on each vehicle — what fails, and what owners say in their own words.
AUDI A4
- 01ELECTRICAL SYSTEM128
- 02UNKNOWN OR OTHER100
- 03BACK OVER PREVENTION46
- 04ENGINE37
- 05AIR BAGS34
Owners report issues like lighting malfunctions and unexplained electrical faults, sometimes shortly after purchase. These can be intermittent and costly to diagnose, so a pre-purchase electrical inspection is wise.
Complaints include abnormal noises (screeching), jerking on acceleration, and transmission shuddering at low speeds. These symptoms suggest potential drivetrain or engine management problems that may worsen over time.
The rear-view camera intermittently fails to engage or shows glitch lines, reducing visibility when reversing. This is a safety concern for parking and could require camera or software repairs.
There are 34 air bag complaints and a recall for the front passenger occupant classification sensor. A faulty sensor can prevent the air bag from deploying correctly, so confirm the recall was performed.
“I purchased a 2024 Audi A4 with 20 miles as a birthday present for my son on 12/20/2023 for $45,028.81 cash, plus traded my son’s 2012 BMW 328i with 22,000 miles and they applied $8,500.00 credit. This is an Atlanta, Georgia Audi dealership. My son drove the…”
“Owner of 2019 A4 recently purchased from dealership after lease expired in Feb.2023. Currently with only 36,800 miles, took vehicle to inspect on Nov.24th and nothing but a front light replacement and suggestion of new tires in inspection video. The factory w…”
AUDI A6
- 01ELECTRICAL SYSTEM123
- 02ENGINE41
- 03FORWARD COLLISION AVOIDANCE27
- 04UNKNOWN OR OTHER23
- 05POWER TRAIN21
Owners report water ingress causing wiring harness corrosion, leading to electrical failures and mold. This can result in costly repairs and health concerns, so check for leaks and musty odors.
Complaints describe sudden loss of engine power and throttle response, often with a 'Maximum engine speed 2500 RPM' warning. This can leave you stranded or in a dangerous situation, so a thorough test drive and diagnostic scan are essential.
Multiple warnings and even steering lock have been reported, along with ADAS malfunctions. These failures could compromise safety features you rely on, so ensure all driver-assist systems work properly.
There are 21 power train complaints, though specific patterns are not detailed in the sample. Given the engine power loss reports, transmission or drivetrain issues may also be present, warranting a mechanic's inspection.
“* Passenger front Seat wiring harness corrosion and failure due to water ingress due to leaking web plate in the longitudinal member on passenger side. Water ingress in passenger compartment caused electrical failure and black mold to grow in the interior car…”
“While operating the vehicle under normal driving conditions, the vehicle suffered an immediate, un-commanded loss of engine power and throttle response. The vehicle displayed a critical dashboard restriction stating: “Maximum engine speed 2500 RPM”, forcing a…”
Official recalls
Safety recalls on record
Federal recall campaigns — the defect, the risk, and the fix. Confirm any open recall was completed before you buy.
AUDI A4 — 14 recalls
The defect: Volkswagen Group of America, Inc. (Audi) is recalling certain 2017-2020 A4 Allroad, A4 Sedan, 2018-2019 RS5 Coupe, 2019 RS5 Sportback, 2018-2020 A5 Cabriolet, A5 Coupe, A5 Sportback, S4 Sedan, S5 Cabriolet, S5 Coupe, and Audi S5 Sportback vehicles. The cable connecting the seat heater to the Passen…
The risk: A disabled passenger air bag increases the risk of injury in the event of a crash.
The fix: Dealers will replace the connecting cable and either the heating mat or entire seat cover, free of charge. Owner notification letters were mailed January 7, 2022. Owners may contact Audi customer service at 1-800-253-2834. Audi's number fo…
The defect: Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Audi A8 and S8, 2022 Audi A5 Sportback, A4 Sedan, E-Tron GT, Q3, Q5, RS6 Avant, A3 Sedan, S5 Sportback, Q5 Sportback, Q7, Q8, RSQ8, SQ7, SQ8, and S3 Sedan vehicles. A software error may prevent the rear-view image from initially dis…
The risk: A rear-view camera that does not display an image reduces the driver's rear view, increasing the risk of a crash.
The fix: Dealers will update the infotainment unit parameters, free of charge. Owner notification letters were mailed November 9, 2021. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 91CR.
The defect: Volkswagen Group of America, Inc. (Audi) is recalling certain 2022 Audi A6 Sedan, A4 Sedan, Q5, and Q5 Sportback vehicles. The semiconductor inside the engine control unit may short-circuit and cause an engine stall.
The risk: An engine stall can increase the risk of a crash.
The fix: Dealers will replace the engine control unit, free of charge. Owner notification letters were mailed July 18, 2022. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 24iH.
The defect: Volkswagen Group of America, Inc. (Audi) is recalling certain 2021-2022 AUDI A8, A6 Allroad, E-TRON Quattro, 2022 S3, RSQ8, RS7, RS6 Avant, Q8, Q7, Q3, E-TRON Sportback Quattro, S5 Cabriolet, E-TRON GT, S5 Sportback, A7, A6, A5 Sportback, A5 Cabriolet, A4, A4 Allroad, A3, S8, SQ7, SQ8, S6, and S4 v…
The risk: An inoperative rearview camera display reduces the driver's rear visibility, increasing the risk of a crash.
The fix: Dealers will replace the infotainment main unit, free of charge. Owner notification letters were mailed June 6, 2022. Owners may contact Audi's customer service at 1-800-253-2834. Audi's number for this recall is 91Ei.
AUDI A6 — 41 recalls
The defect: Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2026 vehicles. Please see the recall report for a complete list of models. A software error may prevent the rearview camera image from displaying as intended. As such, these vehicles fail to comply with the requirements of Federal M…
The risk: A rearview image that does not display reduces the driver's view behind the vehicle, increasing the risk of a crash.
The fix: Dealers will update the software, free of charge. Owner notification letters were mailed January 14, 2026. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for this recall is 90TV. Vehicle Identification Numbers (V…
The defect: Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2021 Volkswagen ID4, Audi A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A5 Sportback, A6 Allroad, A6 Sedan, A7, A8, E-Tron Quattro, E-Tron Sportback Quattro, Q3, Q5, Q5 Sportback, Q7, Q8, RS5 Sportback, RS5 Coupe, RS6 Avant, RS7, R…
The risk: An unsecured child restraint system can increase the risk of injury during a crash.
The fix: Dealers will inspect, and replace as necessary, the middle-rear seat belt assemblies, free of charge. Owner notification letters were mailed August 27, 2021. Owners may contact Volkswagen customer service at 1-800-893-5298 and Audi custome…
The defect: Volkswagen Group of America, Inc. (Audi) is recalling certain 2019-2021 Audi A5 Sportback, RS5 Coupe, RS5 Sportback, S5 Sportback, 2020-2021 A4 Allroad, A4 Sedan, A5 Cabriolet, A5 Coupe, A6 Allroad, A6 Sedan, A7, A8, Q5, S4 Sedan, S5 Coupe, S5 Cabriolet, S6 Sedan, S7, S8, SQ5, 2021 Q5 Sportback, Q7…
The risk: Rear axle misalignment may cause premature or uneven tire wear, increasing the risk of a crash.
The fix: Dealers will inspect the rear axle, adjust the alignment as necessary, and replace any prematurely or unevenly worn tires, free of charge. Owner notification letters were mailed March 3, 2022. Owners may contact Audi customer service at 1-…
The defect: Volkswagen Group of America, Inc. (Audi) is recalling certain 2021 Audi RS6 Avant, RS7, 2020-2021 A6 Allroad, S6 Sedan, S7, 2019-2021 A6 Sedan, and A7 vehicles. The score line on the passenger air bag may not have been manufactured correctly.
The risk: An incorrectly manufactured air bag may not deploy properly, and could also eject plastic debris into the passenger compartment, increasing the risk of injury during a crash.
The fix: Audi will notify owners, and dealers will inspect the passenger air bag score line, and repair it as necessary, free of charge. The recall begin March 26, 2021. Owners may contact Audi customer service at 1-800-253-2834. Audi's number for…
Buyer analysis
AUDI A4 or AUDI A6: which should you buy?
The Audi A6 has fewer complaints per year (20 vs. 29.7) but far more recalls (41 vs. 14). In practice, the A4 may have more frequent minor annoyances, while the A6 has more safety-related recall campaigns that should be addressed. Neither is clearly more reliable; both require careful inspection.
Key differences
- The A6 has nearly three times as many recalls (41 vs. 14), often for safety systems like air bags and seat belts, while the A4's recalls are fewer but include camera and seat issues.
- A6 owners report sudden engine power loss and steering lock, which are more severe than the A4's transmission shudder and camera glitches.
- The A4 has more complaints about backup camera failures (46) than the A6 (27 forward collision avoidance complaints), but the A6's forward collision issues can involve steering lock.
- Electrical problems are the top complaint for both, but the A6's are often linked to water leaks and corrosion, while the A4's are more varied (lighting, infotainment).
- Check the rear-view camera operation when shifting into reverse—look for intermittent failure or glitch lines on the display.
- Listen for screeching noises from the engine and feel for jerking or shuddering during acceleration, especially in lower gears.
- Inspect for water leaks in the passenger footwell and trunk, and check for musty odors or mold, which can indicate wiring harness corrosion.
- Test all driver-assist features, including forward collision warning and adaptive cruise control, and watch for any warning lights or steering anomalies.
Before you buy
- Verify that all open recalls for the specific model year have been completed by checking the NHTSA website with the VIN.
- Take a test drive that includes stop-and-go traffic, highway speeds, and reversing to check for transmission shudder, engine power loss, and camera function.
- Have a trusted mechanic perform a pre-purchase inspection focusing on electrical systems, transmission, and for the A6, water intrusion points.
- Ask the seller for maintenance records, especially any repairs related to electrical, engine, or transmission issues.
- For the A6, specifically test the forward collision avoidance and lane-keeping systems, and check for any history of steering lock or ADAS malfunctions.
Year by year
Which model years to avoid
Complaints per model year for both vehicles — lower is better. The spikes are the years to scrutinize.
| Year | AUDI A4 | AUDI A6 |
|---|---|---|
| 2025 | 1 | 9 |
| 2024 | 2 | 3 |
| 2023 | 1 | 2 |
| 2022 | 0 | 0 |
| 2021 | 11 | 17 |
| 2020 | 127 | 25 |
| 2019 | 5 | 114 |
| 2018 | 42 | 2 |
| 2017 | 82 | 20 |
Check the actual car
Comparing models is smart. Checking the VIN is essential.
Brand averages tell you the trend. A VIN check tells you what's wrong with the specific AUDI A4 or AUDI A6 in front of you — accident history, open recalls and title records.
Go deeper
Full reliability reports
- Comparison
- AUDI A4 vs AUDI A6
- AUDI A4 total complaints
- 297
- AUDI A6 total complaints
- 200
- AUDI A4 total recalls
- 14
- AUDI A6 total recalls
- 41
- AUDI A4 avg complaints/year
- 29.7
- AUDI A6 avg complaints/year
- 20.0
- More reliable overall
- AUDI A6
- AUDI A4 top complaint area
- ELECTRICAL SYSTEM
- AUDI A6 top complaint area
- ELECTRICAL SYSTEM