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99 A6 issue

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03-16-2012, 10:58 AM

dealehman@gmail.com

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Join Date: Mar 2012

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99 A6 issue

I have a 99 A6 with codes 16806, 16816,(Main cat 1&2 efficiency below threshold, Misfire Cyl 2&4 16688,16686. I have a vag scanner from Autel. I have put new plugs, wires, and coil pack in about a year ago but haven't driven very much. Maybe 1500 miles. Also front O2 sensors on both banks. I reset the light and drove for about 70 miles and light came back on and was blinking. definetly misfiring. Have had many issues with the coil pack going bad very quickly. Tried different brands and so far not much luck. What is causing this and are the cats bad. Have about 135000 miles on car.

03-16-2012, 10:58 AM
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