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Re: 2001 Audi A6 quattro 2.7l w/ O2 heater codes
Posted to Technical Discussion Forum on 8/3/2007

I have only had one of these in the past but one my my friends who does euro imports gave me this info.

The VW line are very sensitive to changes in resistance in the o2 heater circuits. The slightest bit of corrosion or dirt in the connector will trip a cod... Login to read more.