Simon Allcorn wrote: > > On a '92 90 quattro (v6) can anyone tell me which O2 sensor is label as O2 > sensor 2 (as opposed to O2 sensor 1) on the output from a VAG 1551 ? > > Simon Looking at the engine from the front bumper, O2 sensor 1 is on your left, and O2 sensor 2 is on your right. -- Elliott