Hi,

The cat went on my car, I think due to a misfire caused by a faulty spark plug. The cat broke up and would rattly.

This caused an engine mgt light to come on in the car. I got a replacement exhust which included the cat fitted 4 months ago.

Now periodically the engine light is coming on, the error being Cat bank 1 below effeciency threshold.

What could the problem be? Obviously it could be the cat but the AA man seems to think its probably not and has mentioned the EGR valve.

Does anyone have any opinion on if the EGR valve would causer this issue?

Thanks

Paul.

Paul, July 2010

wont be anything to do with egr valve if diagnostis saying bank one threshold that means it will be the lambda probe at fault in the exhaust. you will see it screwed into the front pipe

stu, July 2010