My E30 318i cabrio just passed the MOT, but the emissions readings were crazy. 0.00% CO, and 1ppm hydrocarbons. The exhaust was excessively hot, and the examiner, and my tame mechanic, suggest that the cat is blocked. However, the car is a 1991, pre compulsory cat vehicle, so I would prefer to do aw...

I've been having similar probs. Just came back from MOT, the examiner thought it was going to fail as he could smell the petrol fumes, but it tested 0.00% CO emissions, and 1 ppm hydrocarbon content!!!! It passed with flying colours, however, I suspect that the cat is blocked. As this is a pre 92 co...