Failed 1st MOT!

[IanBlackburn]

My 4.0 Chim just failed it first MOT on two accounts:

Failed the CAT test - the reading was varying wildly from .2/.3 at high revs to over 2 at med revs. Would this be engine management issue or a faulty cat?

Offside near tyre worn badly on the inside, but loads of tread on the outside. Just tracking or something more serious?

Thanks in advance.

Ian

[andyr]

The cat test could be a faulty lambda sensor, which appears to be quite common - about £100 to fix. The tracking is also a common problem I think. I had it done several times on my chim - its always worth checking the front tires every month or so to see if its ok.

[Graham]

mine failed on lamba 2 years ago... it was a simple leak on one of the pipe joints needed tightening. get the car up on some ramps and have a look for carbon on the joints, then loosen them stick in some gunge and tighten them up... cost me 3 quid at the local tyre place.

alternativley since then i've ditched the cats and found a friendly garage