2018 Audi Q7: engine stalls while driving

Filed Nov 18, 2025 · Engine · PA

I am reporting a progressive oil consumption defect that led to a catastrophic engine failure in my 2018 Audi Q7. The vehicle was purchased Certified Pre-Owned (CPO). I reported the excessive oil use to an Audi dealer. The dealer attempted to address the issue by performing an engine cleaning/flush, but the engine failed shortly afterwards. Over time, the vehicle required frequent top-offs between service intervals. Eventually, the engine suffered a mechanical failure, resulting in a broken exhaust valve and internal engine damage while driving on the highway. The Audi dealer provided a repair estimate of approximately $12,000. Audi of America offered 40% assistance to make the repair, but does not recognize the underlying excessive oil consumption issue. Furthermore, the proposed repair only replaces the damaged valve and related components, but does not address the underlying excessive oil consumption that caused the failure. This means the vehicle may still: •unexpectedly run low on oil, •lose power while driving, •suffer additional internal damage, or •again experience sudden engine failure while driving. These conditions can cause dangerous drivability issues, including loss of acceleration and potential stalling at highway speeds. This appears to be a serious safety-related defect involving lubrication failure, component breakage, and potential loss of power. I am requesting that the federal safety agency review this issue to determine whether similar failures are occurring in other Audi Q7 vehicles with the 3.0T engine.

Filed Mar 10, 2025 · Engine · OH

First time on highway since getting it back from the car repair vendor two days prior. Drive system malfunction occurred on the highway drive approx.13 miles from my house. Car lost power and would stall and would barely idle. Stopped in the middle of highway traffic 3 times. Got the car towed to vendor that had serviced my car 2 days prior which involved changing rear brake pads and rotors, 6 supercharged spark plugs and air filter. Estimate of issue was damaged exhaust valves on cylinder 2 & 4. Recommended service was remove the cylinder heads, replace all exhaust valves, clean pistons and combustion chambers $8,032.99.

Filed Mar 6, 2023 · Electrical, Fuel system · MO

The problem: I was driving and noticed a high remaining fuel range, or a fuel gauge that appears to be stuck at a specific level, I ran out of gas while in motion, and my engine stalled almost causing a crash on the highway. My vehicle was towed to the Kansas City Audi dealer and they have identified the same issue in the recall in the federal safety agency campaign number: 22V155. Audi’s own number for this recall is 20DN. The dealer has quoted $5,000 to make the repair (My vehicle is currently at the dealer). My 2018 Q7 has the same engine as the 2018 A7 where there is a recall regarding the same reported issue. "The fuel level sender, which is located inside the vehicle’s gas tank, may get stuck on the gas tank’s ventilation pipe, leading the dashboard display to show an incorrect gas level and remaining range level."

Filed Jul 22, 2021 · Transmission · NJ

When I was driving and trying to make a right turn to merge into the traffic, the transmission suddenly stalled and stuck in neutral, put my car in the right lane with large traffic on the lane and forced other cars to make sudden stop. After restarting the engine multiple times, it was suspected that somehow the transmission is always in neutral while the onboard system showing it is in driving mode. I had to get out of the car to push it to a safe side road. This is all sudden while car engine is running. Initially the onboard dashboard shows Transmission Malfunction, but after restarting even that error message disappeared, while the transmission is still not engaging.

Filed Apr 9, 2018 · Acceleration, Electrical · 2,600 miles · AZ

The 2018 audi q7 has been in for service three times since I leased the car on 9/11/2017. My initial inquiry related to technology issues was back on december 22, 2017 that was shortly followed up by a service appointment. After your team assessed the issue and allegedly reset the system, I checked out of the service department, only to experience the same technology issue as I was driving off the lot. Your team proceeded to check the vehicle back in for further investigation. Aside from continued reboots of the audi computer system or mmi system, the car would flag audi pre sense warnings and force the car to stop in the middle of intersections, mid turn. Oncoming traffic was estimated at 150 yards from the intersection when the car jammed to a stop. The sensors appear to stop the car after identifying a false read. The car is then stalled in the middle of an intersection causing significant safety risk. Audi replaced the mmi system and the fuel tank after identifying a faulty valve. After the repairs, the vehicle continued to have the same issues. Audi was not able to identify the source of the issue and claimed that the pre sense system sensors were set to a high sensitivity. They also claimed that a pothole or a bird could set off the sensors, causing the vehicle to stop in the middle of an intersection. This seems like a serious safety issue. By the way, I was driving a loaner car for over three months while they attempted to fix my vehicle and false pre sense warnings are common.