2018 Audi A4

The Audi MMI system began to spontaneously restart while driving after owning the car for a couple of years. It would power off and reboot at random intervals. It became more frequent and is both distracting and dangerous as you lose all navigation, and camera function while it reboots not to mention any telephone connection. This happens every couple of minutes and multiple times per drive. Took it to the dealer (Kendall Audi of Bend) and was told the MMI needed to be replaced. Spent approx. $2500 to have MMI replaced and now it has started happening again with the NEW MMI. There are MANY MANY other complaints with this same issue on Reddit and the Audi World Forum and it needs to be addressed by Audi.

Fortunately no catastrophic failure or accident occurred. At about 40,000k miles the rear spring mounts are significantly corroded and need replacing. This appears to be a galvanic reaction that occurs due to a design flaw which shortens the life of the critical mounts. I’m told one could fail imminently and the other is headed that way. Had this failed in use the damage would be significant and caused an accident. The service advisor said that Audi is aware of the short lifespan and has an improved version that will be used in the repair. I have a video of one of the mounts and will request the parts when repaired.

SAFETY AND THEFT ISSUE!! The door lock actuators on two doors of vehicle. Front and back seat where children ride. The actuators failed to engage leaving it easy for anyone to open the door from the outside even when presumed locked. Actuators do not engage which leaves vehicles prone to theft and allows anyone to open the door included a child from the inside of the vehicle at any time.

I was rear-ended at a slow speed. I was stopped at the time. The driver who hit me was decelerating hard. Damaged to rear bumper. When I got back in the car, I realized that telescoping steering column had been pulled toward me. This would have been bad had I been shoved into the car in front of me and the airbags deployed too close to me. Luckily, this did not happen.

The all-wheel-drive clutch in the vehicle had to be replaced. The symptoms were heavy vibrations or thumping when starting to drive forward from a stop with the wheels turned in either direction. A dealership - New Country Audi of Greenwich - did the repair at a cost of $4,308.85 (including tax). This drivetrain failure occurred at less than 48,000 miles. The vehicle came with a 50,000 mile or 4 year warranty. Since it was in service for over 5 years, this defect was not covered under warranty. There is a Techical Service Bulletin on this issue, number 39 21 43 2059057/4 July 16, 2021. The dealer confirmed my issue was indeed the same as that addressed in the TSB. It seems to me that a major known issue occurring at less than 50,000 miles is a defect. I do not know if it is ultimately a safety hazard, but it seems it could become dangerous if not addressed. For reference, I am attaching the TSB and the repair invoice.

While driving there was an internal failure of the front differential which caused debris to fly out and the debris then punctured the transmission according to the diagnosis on an Audi dealership. The car jerked to a stop and would not move. If this happens at high speed it represents a sever safety risk to the occupants. The vehicle has been inspected by the manufacturer and insurance representatives as well as by a dealer. There were no warning lamps, messages or other symptoms and this happened with no warning.