Driving uphill in the mountains 120kph for 20 minutes or so the check engine light comes on. When I scan the fault it shows as O2 sensor circuit (malfunction bank 1 sensor 1 & bank 2 sensor 1) I can reset the fault but it returns when climbing mountain roads at speed. They are the sensors before the catalytic converters. left and right side.
I have an A4 2.8 quattro 1997
Does anyone know what would set this fault?
Thanks Kevin

 

What is the actual code you are pulling when you scan it?

Doug

 

Hi Doug,
There are 2 codes,
The first is VAG 16514, O2 sensor circuit-malfunction (bank 1 sensor 1) and it cross references to SAE P0130
The second is VAG 16534, O2 sensor circuit-malfunction (bank 2 sensor 1) and it cross references to SAE P0150
The O2 sensor Bank1 sensor 1 is in the exhaust manifold, right side ahead of the catalytic converter
The O2 sensor Bank 2 sensor 1 is in the exhaust manifold, left side ahead of the catalytic converter
Kevin