John

It was a coil failure. He reckons he only drove it four miles. Mind you, when I approached the car with scan tool in hand, he was revving the nuts off it & it was missing like a pig (whatever that means).

Actually it came in today for a few days & I spent some time scoping both sensors & getting some gas readings. Guess what, the bloody thing wont flat line now & switches fine. I had it on test for over an hour at 2,500 rpm & never did it go open loop. The gas readings were as expected for a dead catalyst.

I have it for a few days so I will try a few times to get to the bottom of this.

Cheers

Dave