Hello,

I am seeking advice for my Audi Q7 Diesel 2017 (pre timing belt fix). I have a great fun of having nox sensor cabling in front of the car chewed through by a fox triggering engine fault warning. From the garage that did the inspection I got a massive 1150 quid bill, which to me feels like heavily inflated as they would keep car for the day for what sounds like a unplug - plug in work. And I am basing it on the recommended tyre change price. Has anyone dealt with this? Is rewiring an option? I am based in south east London (Sidcup), does anyone knows VAG specialist that would not be insanely far that would help me out?

As far as I know there’s two NOx sensors, upstream and downstream on exhaust, bank 1 and bank 2, however the individual component price if genuine Audi is expensive. Should be straight forward to swap out, clear error codes with VCDS. Is it just one sensor. A scan will determine based on fault code.

Anything is possible regards rewiring, but given their inherent cost, they are very sensitive bits of kits in terms of measuring emissions.

thanks for coming back. I was thinking maybe even find a used part. But so far honestly struggling a bit with identifying oem number

Sorry for being spammy, this is the image:

Regards rewiring, looms are expensive and difficult to renew. I personally would find an auto electrician and splice in new cabling where needed using waterproof connectors.

I echo David's suggestion of repairing the existing wiring rather than a new loom. Looms are individually made at the factory to suit each specific car specification. Apparently it is cheaper to do that than to fit universal looms which wastes wires that are not used in some specs.