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Audi Q7 Problems

Check Engine Light Due to Knock Sensor Fault on Audi Q7

Problem Description and Possible Solution

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.

(18 people reported this problem)

Audi Q7 Vehicles With This Problem

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Average mileage: 76,500 (51,000–120,000)
6 model years affected: 2007, 2008, 2009, 2010, more2011, 2012
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Viewing 1-6 of 6 comments
I was told by the Audi technician during an oil change that they noticed a knock sensor problem that generated a check engine light that came on for a few days and then went out. I haven't had anything done for it yet. 2011 Q7 TDI
Nox sensor replaced at 104,546 miles. Now at approx 105,500, I am told it needs to be replaced again...are you kidding me?! It is the TDI--I'm wondering if related to that issue.
Engine light came on for three days. Of course by the time I scheduled an appointment the light went off and the dealer said they couldn't run the diagnostic. Low and behold, a month later the light comes on again. I immediately bring the car to the dealer. They run the diagnostic and say the knock sensor is faulty. I will need to replace the sensor. I am awaiting the part availability and cost estimate.
Low oil indicator light comes on when engine cold - parked on level surface. Oil is not low but light remains on until engine is warm.

NOX sensor comes on and the goes off and then back on again. It is not flashing but showing solid illumination for hours and then goes out and then comes back on. Shop says replace it for about 4-5 hundred but warned, "It might come right back on."
Nox Sensor (the 1st of 2) failed at 62,000 miles. Engine light illumination was the only indication. No performance issues noted. Again had a Nox failure at 85,000 miles. Both times the repair cost over $900. This MUST be related to the VW/Audi/Porsche emissions fiasco that is underway. I think both repairs should have been covered as a warranty repair.