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Engine & cooling

2021 Audi A4 Engine problems

Owners have filed 1 complaint about the 2021 Audi A4's engine & cooling with NHTSA - 9% of all its complaints, most recently on April 1, 2025. Stalling, loss of power, oil consumption, overheating, head gaskets, timing chains and engine failure.

Complaints
1
Recalls
0
Crashes
0
Fires
0
Injuries
0
Deaths
0

Engine complaints

Transmission & drivetrainEngine & cooling

The vehicle at 13,[redacted] miles on the high ways, and during stop & go traffic; vehicle begins to tremble, transmission and floor shakes, rpms are higher than normal, abnormal noises coming from engine (screeching), jerking on acceleration on the first gears, rough idle, happens only on highways after 1hr of driving. Can drive over 40 min without any check engine light turning on. No codes come up, while clearly having issues. After a day of being off, car goes back to normal without those issues, just...

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vibrations and pulsing on idle. -happens on Texas highways where vehicle begins to have trouble with acceleration and transmission shakes yet no check engine or error messages appear. -problem has been shown to one Audi dealer while happening and another Audi dealer was able to reproduce the problem. They even noted how vehicle will do all the issues noted above while not providing any error codes or messages. - vehicle has been inspected but all they do is reset software and hand back keys. While issues are still prevalent. - no warning, no over heat or any codes appear on the vehicle. Issues started at 13,[redacted] miles. Only on long highway or stop and go traffic does it happens

Filed Incident Power train · Unknown or other · EngineNHTSA 11652167

Audi A4 engine complaints by year

A4 engine problems, every year

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Source: U.S. National Highway Traffic Safety Administration (NHTSA) complaints and recalls, checked . Complaints are owners' own reports and are not verified. How we use the data

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