2017 Audi Q7: misfire or rough idle

Filed Oct 25, 2026 · Engine · NC

In XXX, my 2017 Audi Q7 3.0T unexpectedly lost engine power while traveling approximately 70 mph on a highway in [XXX]. A "Drive System Malfunction" warning appeared. The driver pulled over, shut off the engine, and restarted it; the vehicle then drove normally. The sudden reduction in power at highway speed created a risk of collision with surrounding traffic. The precise cause is UNKNOWN. I reported the highway-speed loss of power and warning to Audi Wilmington. At its XXX visit (102,255 miles), the dealership documented the warning and multiple engine misfire codes. It identified a vacuum leak at a broken oil-fill pipe neck, replaced the pipe, cleared codes, and reported no issue during its test drive. The intermittent power loss did not recur during that visit. The vehicle also had recurring excessive oil consumption. In XXX (104,261 miles), Audi Wilmington found it approximately 1.5 quarts low and documented possible piston-and-ring replacement if proposed treatments failed. Those proposed repairs were not performed. In XXX (approximately 109,320 miles), the vehicle again showed a Drive System Malfunction warning and check engine light. Maguire Audi documented multiple misfires and a persistent cylinder #2 misfire after service, and suspected internal engine damage. The vehicle has been out of service since then. Independent testing in XXX confirmed cylinder #2 had 35 PSI compression and 100% leak-down, with part of an exhaust valve missing and oil on the piston. The connection, if any, between the XXX power loss and later engine damage is UNKNOWN. Authorized Audi dealers and an independent shop have inspected the vehicle; I am unaware of any inspection by police, insurers, or the manufacturer. The vehicle remains in my possession and is available for inspection. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Aug 29, 2026 · Engine · PA

The 2017 Audi Q7 Prestige was purchased on November 7,2016. Since the purchase, all service was provided by one or the other of two Audi dealerships. During this period, the Audi recommended 10K, 20K,30K, 40K, 50K, 60K, 70K, and 80K mile services had all been performed. In the almost ten years that I owned the car, the oil and oil filter were changed 11 times at one or the other of the two dealerships. The mileage interval between oil changes was 6,383 miles on average with a maximum interval on 8,177 miles; the time interval between oil changes was 320 days on average with a maximum of 399 days. The engine oil cooler valve had shorted out internally and was replaced in April 2025 at 58,225 miles. By the end of August 2026, the car had travelled 71,375 miles. From 60,000 miles on, oil consumption has gradually increased to alarming levels:1-quart every 700 miles. On August 22, while driving at highway speed on the Pennsylvania turnpike near Pittsburgh, I experienced a sudden loss of power, rapid deceleration, rough running of the engine, and a “Drive System Malfunction “indicator. Fortunately, I was able to slow the vehicle and safely move off the highway. The car was towed ($396) to an Audi dealership. The technician reported that the diagnostic scan showed a misfire code for cylinder #2; and, upon inspection, the #2 spark plug was found to be excessively oil-fouled. When the technician swapped the coils and spark plugs from cylinders #2 and #3, the misfire remained on cylinder #2. A compression test on cylinder #2 showed 120 psi – below normal, but not low enough by itself to definitively condemn the engine. The cost for this analysis was $500. I declined to invest in further teardown of the engine. Audi purchased the vehicle for $4,000. My experience appears similar to others with the 2017 Audi Q7 with the 3.0 engine. Exceptionally poor engineering and total lack of customer care!

Filed Feb 11, 2026 · Transmission · 120,000 miles · NC

The contact owns a 2017 Audi Q7. The contact stated that while driving approximately 65 MPH, the contact became aware of an abnormal odor. The vehicle started shaking, and the drive train malfunction indicator was displayed. The contact pulled over to the side of the road, and the vehicle was towed to an independent mechanic, where it was diagnosed and determined that the exhaust valve had burned a hole through cylinder #1 due to a misfire. The contact notified the dealer, but assistance was declined. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was 120,000.

Filed Sep 9, 2025 · Engine, Fuel system · TN

My 2017 Audi Q7 Prestige 3.0T 6Cyl GAS CREC Supercharged has experienced repeated, serious failures involving the engine, powertrain, and fuel system. - At 72,000 miles, the vehicle developed coolant leaks under the supercharger, a failed water pump, and soaked drive belts. Repairs included multiple hoses, gaskets, and thermostat replacement. -Shortly after, repeated PCV/Oil system failures caused oil leaks, warning lights, and engine shaking. Repairs included PCV system, oil separator, valve cover gasket, breather pipes, and new spark plugs. - at 111,000 miles, the low-pressure fuel pump and relay failed, causing the vehicle to stall and lose all power while driving- a major safety risk. -Most recently, the engine developed a severe misfire in cylinder #4. Compression testing confirmed abnormally low compression (15 psi) due to a suspected cracked valve seat. The vehicle cannot be repaired without a complete engine replacement, quoted at ~$20,000. Safety Impact: - Vehicle has stalled suddenly in traffic due to fuel and engine failures, risking crash or injury. - Coolant and oil leaks present a potential fire hazard. - Loss of power and shaking while driving put my family and others at risk. Inspection/Confirmation: -All problems have been repeatedly confirmed and repaired by an independent Audi specialty service center (S&S Auto Repair). - Numerous invoices document coolant, oil, fuel, and engine failures. Warning Signs: - Multiple dashboard warning lights appeared either right before or during failure, including engine malfunction, coolant loss, and auto start/stop malfunction. These repeated failures at relatively low mileage suggest a design/manufacturing defect with the Audi 3.0T engine platform that compromises both safety and reliability. The issue seems to be widespread amongst other Audi owners with the same 3.0T engine- Per AudiWorld Forums.

Filed Jun 11, 2025 · Engine · MN

The issue is related to Audi TSB 2048402/3. 2017 Audi Q7 3.0T. First the an engine light appears, then get Drive System Malfunction Warning appears, then car misfires, then car goes into limp mode causing the car to rapidly slow down (while driving on a highway!!!!!). This is is common issue on the 2017 Audi Q7, code is P05A000 Active Grill Shutter "A" Stuck on. Which then triggers the Drive System Malfunction, misfire, and limp mode. Audi will not repair due to mileage on vehicle. Concern is this is a know issue and a safety concern.

Filed Jan 14, 2025 · Engine · OR

Drive system malfunction warning while driving on the highway at 75 mph and the car began sputtering, lugging, jerking and had to be manually shifted to get it safely off the highway. If we had been in traffic we would have been rear ended as the car drastically lost speed on the highway. Dealership initial diagnosis was a misfire in cylinder 4. Upon further inspection we were told that a piece of the exhaust manifold had broken off resulting in catastrophic engine failure and we needed to replace the long block at a quote of $32,000. Car had been serviced only at the Audi dealer and all Audi care maintenance had been completed. We had informed the dealer that the car was burning oil on two previous service visits and we were adding a quart every 1000 miles or so and we were told that was normal for a 2017 Q7 with over 80,000 miles on it. Last service inspection and Audi care package in September 2024 we were told the car was in great shape. Catastrophic engine failure in December 2024.

Filed Dec 31, 2024 · Engine · AL

2017 Audi Q7 with approximately 112K miles consuming oil at a rate of approximately 1qt per 500-700 miles. Misfire occurred on highway and then cleared overnight. Took to dealer and had them swap all coil packs and spark plugs. Approximately 500 miles later, multiple misfires in cylinders 3,5, and 6 and loss of compression while driving on highway at 70 mph. Vehicle taken to dealership where they completed diagnostics. 0 psi compression in cylinder 6, damaged cylinder walls, and broken valve. Cost of repair estimated at $25K.

Filed Dec 9, 2024 · Engine · FL

Oil consumption issue began June 2021 with my 2017 Audi Q7 with the 3.0 engine, we were at 78,841 miles. Our vehicle was always serviced at the dealer on the recommended schedule. The dealer stated high oil consumption of 1 quart per 1,000-2,000 miles was normal. The high oil consumption issues continued. At 99,559 miles the car began shaking on the way home from a routine oil change. They found cylinder 3 spark plug covered in oil and replaced all spark plugs to clear misfires. At 104,002 miles the N428 oil pressure regulation valve was replaced, which seemed to improve oil consumption temporarily, but gradually got worse with frequent top offs. On 1 December 2024 at 123,616 miles the car started to shake while traveling at 70mph on the interstate, with the engine lights on. The dealer found crusted spark plugs and identified that cylinder 1 had a burnt/broken exhaust valve due to excessive oil consumption and residue buildup. The required long block replacement would exceed the value of the car. Clearly a defect in the 3.0 Audi engine.

Filed Aug 20, 2024 · Engine · TX

Oil consumption increased over time to 1qt per 400 miles causing engine misfire in cyclinder 5 then 2,3. Engine now requires exhaust valve replacement and or complete replacement or overhaul at 140k mileage. Problem started at 90k miles.

Filed Dec 28, 2023 · Engine · OH

Cylinder 2 began to misfire at highway speeds. Diagnosed with a burnt exhaust valve in the engine. Possibly also due to the high oil consumption of greater than 1 quart of oil every 1000 miles.

Filed Nov 27, 2023 · Engine · OR

We purchased a 2017 Q7 with low milage. At around 75k miles the engine started consuming oil every 1,200 miles, when previously it never required an oil change before the regularly scheduled service. The dealer always said "that is 'in spec'". This went on for over a year. Then, when we were driving cross-country for thanksgiving in 2022, the engine made a major concussive noise and we lost power while driving on the freeway at around 70mph. This almost caused a high speed collision. It was winter and we had the entire family in the car. we took it to the dealership, and the service tech recommended a compression test and borescope. No carbon build-up was found. Pressure was 'ok' in all cylinders. There were codes showing a fuel injector misfire, so the dealer recommended replacing all of them. The repair was done, but we've continued to have excessive oil consumption, the engine continues to run rough, and we occasionally get 'drive system malfunction' errors. When driving cross country in sub-freezing winter weather, last week, the engine lost power again. I stopped at the nearest Audi service center two hours later, and the tech found that the spark plugs had significant carbon fouling. Spark plugs were replaced. Engine continues to consume too much oil. Based on my research, it appears that this is a known issue, with several class action lawsuits. The Q7 does not appear to be part of these suits (yet), but there are posts and forums all over the internet with owners reporting this problem.