2020 Audi Q7 problems

“COMPONENT: 48V mild-hybrid electrical system — engine ground connections, Belt Starter Generator circuit, and 48V lithium battery. The vehicle is available for inspection upon request; the 48V battery dealer now call failed has not yet been replaced. SAFETY RISK: On 8/1/2026, the vehicle suffered sudden, complete electrical failure while in motion immediately after exiting I-75 in Bradenton, FL, with my family aboard, including a child. The cluster displayed “Electrical system: malfunction! Safely stop vehicle” (red), then total power loss. I coasted into a parking lot; had this occurred minutes earlier at 70 mph in interstate traffic, a stall with degraded accessories would have been unavoidable. The vehicle would not restart until the system cooled. Risk is ongoing: faults now recur almost daily. CONFIRMED BY DEALER: Yes. Audi Sarasota (RO AUCS126809) diagnosed both main engine ground connections left loose after a 2/2026 engine replacement by an authorized Audi dealer — DTC U350100, Control Module Input Power “A” Circuit Low. A prior dealer had misdiagnosed it as a faulty 12V battery and returned the car unrepaired; it failed on the interstate 16 days later.…”

“the first indication of an issue was oil consumption. It was using more oil than usual around the 70K mile mark. Then it started misfiring, and soon after a knocking noise coming from the engine. There are no check engine light on, after bringing it in for diagnostics, it read that it was a spark plug, once they got into the engine they discovered the cylinder had been stripped from the piston. Yes the diagnostics came from our foreign car mechanic. no, it has not been inspected by the manufacturer or police. Just the symptoms. sometimes the light would come on, and then it would go off. At this point it is off. All of this started in the fall of 2025.”

“In July 2023, my 2020 Audi Q7 experienced a complete electrical failure at highway speeds due to a Belt Starter Generator (BSG) malfunction. Audi replaced the BSG with the same faulty part. Months later, I noticed increased oil consumption and loud engine noise. Despite multiple service visits and reporting these issues, Audi failed to properly diagnose the problem. In January 2025, despite a clear check engine light indicating a problem, Audi dismissed my concerns. Just weeks later, in February 2025, the engine catastrophically failed due to undiagnosed internal damage. Audi repeatedly ignored diagnostic warnings and failed to address my complaints, putting my safety at risk. Audi consistently dismissed my concerns, attributing engine noise and oil consumption to normal wear. The failures posed safety risks, including sudden loss of power while driving. Despite documented defects, Audi refused to take responsibility or perform proper diagnostics, resulting in continued safety hazards. I am formally requesting NHTSA to investigate the widespread issues affecting the 2020 Audi Q7, including the BSG system and excessive oil consumption leading to engine failure.”…”

“See attached document for complaint.”

“Often gets warning about Parking Brake malfunction. Dealership already checked once and could not find the problem. Warning comes on speedometer as follows: "Parking brake: malfunction! Please contact Service."”

“While driving, Forward Collision Warning appears without any reason. My understanding is that the car will brake itself if it senses frontal collosion and I am concerned that it might brake suddenly without my knowledge and cause an accident.”