I just bought a 98' A6 Quattro. The service inspection light flashes when I start the car, and sometimes the check engine light comes on. I had a local mechanic do a diagnostic and the reader found nothing, and at the time he did his check the "check engine" light was off.
Is there a way to reset the service inspection light? And is there another way to find the check engine light issue? Also is there a way to reset the engine light after we figure out the problem? Thanks for any help

 

press and hold button under the tach then turn ignition on ( do not start engine ) then release and turn button under the MPH to the left ( while ignition on till you see 10,000 in the odometer then switch ignition off and your done

 

When the check engine light comes it should store the code for like 40 ignition key cycles. If theres no faults stored youll have to wait untill the light comes back on again to find out the cause.