Originally Posted by
STAFFY OWNER
Most likely one of your lambda sensors is buggered, I thought the fault code usually indicated whether it was pre or post cat.
Bank 1, sensor 1 is pre cat, bank 1, sensor 2 is post cat.
If it was a V6 and had 2 manifolds with 4 sensors for example, it would be bank 1 sensor 1, bank 1 sensor 2, bank 2 sensor 1 and bank 2 sensor 2!