Hi. I'm new to the forum and I'm doing a bit of research. Does anyone know where all the oygen sensors in an Audi A4 2000 are located? How many are there? It has the 1.8t if that makes any difference. Thanks

 

Anyone?

 

Not really sure - but I think one is pre-Cat and one is aftere the cat (Catalytic converter)

 

yes you probably have 4 sensors total as brrman said. I'm not all that familiar with your engine, but stick your head into the engine bay and look where the exhaust connects to the engine. You should see a sensor sticking out of the piping with some wires attatched to it. You may need to remove an intake hose to see the one on the left side. This is all speculation, as I have a 97.

 

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