Audi Q7 Problems

RepairPal has identified the most common problems with the Audi Q7 as reported by actual vehicle owners. We'll tell you what the problem is and what it'll take to fix it.

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8
Known Problems

Popping sounds from the rear of the vehicle may be heard moments after starting the engine, or when slowing to a stop. This noise is from the leak detection pump filling the fuel tank with air, and releasing to retest the system when it finds a fault. The sequence of faults identifying this issue are as follows:

  • Succession of loud pops from rear of vehicle
  • Pops go away, and fuel economy decreases 
  • Check engine light illuminates
  • OBD trouble code P2404 and/or P0441 is stored
  • Engine will not start after refueling (must crank for over 30 seconds)
  • Vibration when slowing to a stop

The cause is a valve which is mounted on the front of the intake manifold, commonly called the N80 valve, or EVAP system purge valve. The valve is designed to open under specific circumstances, but a worn valve will remain open at all times, preventing the pressurization of the fuel tank. 

Correction of the issue is to replace the N80 valve with the latest revision. 

The Check Engine Light may illuminate with a knock sensor code stored. Our technicians tell us a revised knock sensor and bracket should be installed, along with heat shielding material to protect the new sensor, to correct this condition.

An engine misfire may be noted after cold start resulting in illumination of the Check Engine Light. Our technicians tell us updated powertrain control module (PCM) software is available to correct this concern.

The Check Engine Light may illuminate due to various camshaft and crankshaft position sensor and/or correlation faults. Our technicians tell us that revised powertrain control module (PCM) is available to correct this concern.

A brake pedal pulsation may develop, most commonly the front brakes are at fault. Just to be sure, our technicians recommend that both front and rear rotors be inspected. Brake pads and rotors should be replaced as necessary to correct this issue.

Uneven ride height and/or tilting of the vehicle may be caused by one or more stuck closed residual pressure holding valves. A service bulletin from Audi describes how to properly test these valves. Any valve failing this functional test should be replaced.

Axle constant velocity (CV) boots may crack and leak, resulting a lack of lubrication and damage to the CV joint. Our technicians recommend to replace damaged CV boots at the first sign of cracking. If noise is noted from the CV joint the axle may require replacement.

Various steering, suspension, and sub-frame bushings and mounts can deteriorate over time resulting in noise and/or handling issues. Our technicians recommend periodic inspection of these components and replacement as necessary.