2021 AUDI Q7 Engine Problems

- Engine water pump failure and coolant intrusion into the vacuum system. Parts were replaced on 5 Nov 2025 and possible still at the dealer's location. - The defect poses the following safety risks: It resulted in contamination of vacuum lines; potential for sudden engine stalling or loss of power while driving; potential for catastrophic damage to engine-management systems dependent on vacuum integrity; potential for damage to emissions and combustion-control systems; potential for reduced braking system performance if vacuum supply is compromised, expensive and unexpected component failures, and possible recurrence since the cause appears related to design rather than normal wear. Any failure can create cascading hazards affecting safety-critical functions. - The problem was confirmed by an authorized Audi dealer. Dealer name and contact info can be provided upon request. - I do not know if the dealer delivered the involved parts to the manufacturer or insurance representative for inspection. Police or others did not inspect it. - There were no warning lights, messages, or other symptoms of the problem prior to the failure. It was identified by the Audi technician on 5 November 2025 while the vehicle was in the dealer for other services. The failure occurred at 47,855 miles which is far below the average lifespan of a water pump or vacuum system.

My water pump went out on my 2021Q7. The car had 57271 miles on it. I looked up the Vin and it is not covered in the class action lawsuit however, my model and my year comes up but not my Vin. I feel a water pump should last until 100,000 miles.

During a routine service on my 2021 Audi Q7, the shop found the coolant level low and traced it to a leak. The Audi dealer later diagnosed failure of the water pump, thermostat, valves, and related parts, with a repair estimate of nearly $5,000. I discovered that prior model years (up to 2020) were included in a class action lawsuit for the same type of cooling system failures, though my VIN is not covered. This appears to be the same issue, happening just a few months outside of warranty, and raises concerns about premature failure and safety risk from overheating.

El carro fue comprado en febrero 2024 en greenway ford inclui un paquete de cambio de aceite,rotacion de llantas y cambio de los limpiabrisas.esto ha sido un dolor de cabeza. cada vez que se le realiza el servicio sale con la luz del ingenier prendido, en la computadora de auto zone aparece TURBOCHARGER INTERCOOLER(P0299). Ademas El asiento del pasajero esta siempre muy caliente el carro gasta demasiada gasolina y esta perdiendo velocidad,en verdad no se si el carro esta gastando aceite, ya que recién cambiado el sistema me mostro falta de aceite .o el consecionario no cambio el aceite correctamente..

I am reporting a severe defect in my 2020 Audi Q7 involving “coolant migration” due to a faulty water pump, a known issue in Audi models (Q7, S4, A6, 2013–2022). This poses critical safety risks due to sudden failure with minimal warning. My out-of-warranty Q7 showed minor coolant fouling near a solenoid, with normal coolant levels and no fluid added. The dealer quoted ~$6,000 to replace the water pump and vacuum system. This defect is highly dangerous due to: Sudden Power Loss: Coolant in the vacuum system impairs solenoids and lines, disrupting engine/turbo function. This can cause abrupt power loss, risking loss of control in traffic or at high speeds, potentially leading to collisions. Catastrophic Overheating: A failing water pump may halt coolant circulation, causing rapid engine overheating without warning, risking sudden engine shutdown and stranding drivers in hazardous conditions like highways. Brake Assist Failure: The vacuum system powers the brake booster. Contamination can reduce braking effectiveness, increasing pedal effort and stopping distances, heightening collision risks in emergencies. Emissions Control Issues: Coolant fouling affects PCV and EVAP systems, causing misfires, stalling, or increased emissions, potentially triggering check engine lights and compromising engine stability. Undetectable Progression: The defect often shows no clear symptoms or warnings until severe damage occurs. My vehicle had only minor fouling that could only be detected by visual inspection, yet extensive repairs were needed, indicating the issue’s stealthy nature, which prevents timely driver intervention. Systemic Issue: Forums and a class-action lawsuit confirm this defect across Audi models, yet owners face high repair costs post-warranty. This defect endangers drivers and others by risking vehicle failure, impaired braking, and unstable performance. I urge NHTSA to investigate and mandate a recall or extended warranty.

Driving on highway at 70 mph and high engine temp light came on. Said to pull over and continue to run car until temp decreased. I got over as quickly as I could ( no more than 1/4 of a mile) and sat on side of PA turnpike as engine cooled. I was at bottom of an exit ramp. I slowly proceeded up the ramp and warning came on again and red temp light reached again. I pulled right into the gas station at top of TP exit ramp. It still said to continue to run the car. I sat with my son in the car and ran the car in the shade. The temp was decreasing and then all my electrical lights came on, yellow battery warning light on and then suddenly the red battery light and all systems failed. Car turned off. Called AAA to take to my mechanic as Audi was a 3 hour wait for a tow and 3 weeks for service appointment with no loaners available. My certified mechanic said water pump completely dislodged. He replaced water pump, thermostat (which was already replaced bc it failed in year 2 of ownership). After repair, 48 volt battery would not take a charge. Assumed faulty alternator and/or battery. Alternator was already replaced once at year 1 as car died while driving as well. We had car towed to audi and they are reporting known issues with water pump but not issuing recalls. Also known issues with alternator repair parts that were used in year 1 but no warning to consumers. They are diagnosing problem now and if alternator and subsequent battery issue, it will be covered but not if battery issue comes back as electrical in nature.

During commute dash lit-up with "central indicator light", "Vehicle starting system; malfunction! Please contact Service" warning notice, "Audi pre sense" yellow-lit dash warning light, yellow-lit battery warning light that alternated to red-lit battery warning light. AC automatically shut off, radio shut off, was able to limp vehicle home. Restarting the vehicle gave a "Battery low voltage" reading then a vehicle failure "immediately turn vehicle off when safe" message followed by the "Vehicle starting system; malfunction! Please contact Service" warning notice. Towed Audi to local Audi shop in Charlottesville, VA, where it was diagnosed with starter generator failure, part was reportedly ordered on 27 July 2024; no indication as to whether the part has arrive at Audi shop. No details on the battery as of 01 August 2024.

Water pump started leaking at 55K miles resulting in low coolant level. Vehicle was inspected by the dealer and confirmed that replacement is required.

CARRO COMPRADO 13 DE FEBRERO DE 2024 APROXIMADAMETE A LAS DOS SEMANAS SE PRENDIO LA LUZ DE PRESION DE LLANTAS Y EL ENGINIER, SE LE METIO LA COMPUTADORA Y ARROJO EL CODIGO P0299. SE PAGO POR LA REPARACION EL DEALER LO MANDO A UN TALLER PARTICULAR PORQUE ELLOS MANEJAN ESE TIPO DE CARRO . ACA LO ARREGLARON CUANDO LO MANEJAMOS VOLVIO A SALIR LA LUZ LO ENVIARON NUEVAMENTE AL TALLER Y ELLOS LO REENVIARON A LA AUDI . AHI LO REPARARON VOLVEMOS A MANEJARLO Y SALE LALUZ NUEVAMENTE... AHORA EL VENDEDOR NOS DICE Q HAY PROBLEMA CON LA BOMBA DE AGUA Y Q ESTO ES LO QNOS HACE PRENDER LA LUZ ..SU COSTO APROXIMADO DE 4000 DOLARES... EN CONCLUSION ME VENDIERON EL CARRO MALO.. ME ESTAFARON ... ELLOS NUNCA ME DIERON EL INFORMA DEL CARRO NI DEL SERVICIO Q ELLOS NO LO TENIAN Q HACER...

While driving with my 4 year-old daughter a notification appeared on the driver display that there is an “Electrical Malfunction” and to call the service department. A few minutes later, while actively driving on the same busy road in my town, the vehicle completely turned off, including the power steering and ABS breaks. I was stuck in the middle of a busy intersection with no hazard lights and no ability to even shift the vehicle into neutral to move it. I was genuinely concerned for my safety and the safety of my daughter, as we were stranded in the middle of a busy intersection during rush hour. It was a harrowing experience to say the least. Eventually we had the vehicle towed. When I called Audi, they informed me that they suspected it was the “starter generator” and that they were aware of the issue, but this was the first I had heard of it. They subsequently confirmed that it was the starter generator and are less than accommodating.

Multiple warnings indicating to contact dealer (Lane departure, adaptive cruise control, collision avoidance, electric system malfunction, steering malfunction) then a few minutes later transmission failure and engine failure imminent.... attempted to move out of traffic. Luckily, I made it to the right lane before the steering shut down, then the transmission failed (stepping on the gas caused the engine to rev, but no power was delivered to the wheels), and last the car completely died. Had to have it towed to dealership. Dealership confirmed that the starter/generator failed.

While driving the vehicle, error messages began appearing on the in-panel dashboard display. At first, a yellow/orange battery icon appeared with the message "Electrical system: malfunction! Please contact Service". Within an hour, the car experienced another electrical system malfunction (red battery icon appeared with the message "Electrical system: malfunction! Safely stop vehicle") along with a host of other error messages (Brakes: malfunction, Steering: malfunction, Parking brake: malfunction, Vehicle lights: malfunction, Stabilization control (ESC/ABS): malfunction, Drive system: malfunction, Transmission: malfunction). The car was undrive-able at this point, coasted to a stop and could not be restarted while on an active roadway. The car had to be towed to the dealership, where it still remains today. * Components or systems malfunctioned: Electrical system, brakes, steering, parking brake, vehicle lights, stabilization control (ESC/ABS), drive system, transmission. It is available at the Audi dealership service location for inspection * My safety was put in significant danger due to the car shutting down on an active roadway with no control over the vehicle. * The problem has been confirmed by the dealer. * The vehicle has been inspected by the dealership service center but not by police or insurance representatives. * Many warning lamps and messages appeared within an hour of the car becoming inoperable.

Electrical failure indicator lit up. I was on my way to the dealership service center. Within 10 minutes of driving, the car completely shutdown right at a busy intersection and before an active railroad crossing. Tow truck was called by the police as the car was not starting and therefore undriveable.

I pulled out of the gym after using my key FOB to unlock and start vehicle. Got a warning asking if Key was in the car, it was, and warning went away. A 1/4 mile later, while the car was in drive and idle at a red light, the car completely shut/locked down and alarm started blaring saying there was no key. The key was in the car (it had just unlocked and started the car less than 4 minutes earlier). The car defaults to ON of an auto/on function (gas saving feature?), and I believe that becuase the car was waiting at the light, prompted the computer to misfire functions. I was stuck in traffic and could not get the car to start for over 3 lights length of time. I also found I had no control of the hazard lights. I was able to eventually get it to turn on, alarm persisted. I then drove it home with alarm still blaring and got my spare key, the alarm shut of briefly and then turned back on. I then drove it to Audi servicing while alarm blaring. They assessed the vehicle over the past 10 days and simply told me it was due to the key FOB battery dying. Meaning: they are telling me that this is normal and will continue to happen every time my battery dies. This is very dangerous. I don't know how/if they actually confirmed the battery was dead or simply changed it out. The key FOB battery dying should NOT cause a car, while in drive, to completely shut/lock down. This is a huge safety issue. Someone could have not seen me and rear ended me. Or if I was in traffic on the freeway and my FOB battery dies, then I would really be in trouble. I have other Audis and a FOB key dying has never caused a lock down. Once the car is in motion, the ability of the key fob to affect the ignition or engine should be zero. I believe this issue needs to be looked into and am not getting good response or action from AUDI. I do not feel safe driving a car that will lock down while in drive, and my concern extends to other people who may find themselves in this situation.