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Audi A8 Quattro Questions

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VAG codes: 16539, 16684,16875,16876

Car seems to run fine, looking for least expensive way to pass NM emissions.
Beautiful car/runs fine 126K VAG codes: 16539, 16684, 16875, 16876.Trying to find least expensive way to pass emissions.

Beautiful car/runs fine 126K VAG codes: 16539, 16684, 16875, 16876.
Trying to find least expensive way to pass emissions.

Thank you.
dash symbol for head lights indicates that cars automatic focus for road conditions is not working.
My warranty company denied paying a claim to replace my cam position sensors because the emissions control system is not covered under my warranty. Is the cam position sensor a part of the emissions system?
The camshaft solenoid was replaced to fix check engine light with fault code P0024. Check engine light reappeared after a month with same fault code. I was advised that I now need to replace the timing chain, tensioners, and guides. According to the technician, the timing chain may have stretched a bit because of wear and tear. Which is causing the check engine light to reappear.
E or plenum ? It is the green plug one I am looking for the cable runs under the plenum. Any help would be helpful.
Took car to dealership it been diagnosed has the ac compressor . The cost qouted was 4k. Very mechanical minded
I have to place it in neutral when it engine dies and restart it. I dont know the problem. Please help. Thank You
while driving the car is jerking and feels like it wants to go off
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