Hi, not an issue as such but more of a (CAN IT BE SAVED) type of thing? Before I took the head off my engine due to head gasket issues the mot that I had on it just passed the emissions test.. The lambda was fine.. So I've put this down as coolant being mixed with combustion and covering the internals of the cat causing damage that's why it just passed the test. The cat has only done 10,000 miles. Now I've rebuilt the head and it's all fresh and clean. At the time of the mot I didn't realise that the head gasket was on its way out as it didn't show any signs at all.. It was about a month after the mot it started losing coolant and misfiring etc.. I've read that cat cleaners don't work and others have said to run the engine up to temp, disconnect a coil pack and run engine at 2000 rpm for 5 to 10 mins to clean the cat?? Or should I just by new? Thanks in advance.

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C. Hughes

no, its not like a DPF.

not sure why the hell you would run it with an intentional misfire, as that will just dump neat fuel into the cat and definitely kill it off, as well as killing the rings and bore on that cylinder after washing the oil off with neat petrol.


you say its only 10k miles old so its not going to be a decent genuine unit, but a cheap aftermarket one and these never last long, two to three years is the best I've had from them.


best bet is to get it nice and warm on a good road test and see what happens.

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