The eml did come on and give the code above but only during the emission test while it was at high revs, but he cleared it and it hasnt been on again. Said it came on due to high values during the test. What does the lambna sensor after the cat do? I assume the first one is used by the ecu to control fueling, IF that was at fault and misreading would it cause this issue. The fault code says something like bank 1 sensor show rich or something. Or could a slight misfire cause rich running, i cant pick up on any misfires but the car doesnt pull quite like it used to. Think it may be better to get it in somewhere but im not wanting to put aload of cash into the car really if there is a change it could be a quick fix.