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Ford Mondeo failed its MOT exhaust emisson test

My x-reg ford mondeo has just failed its MOT on its emission test. The test shows that the carbon monoxide is too high 0.77% fast idle test, 0.60% second fast idle test. The HC is within limits as is the lamda. The garage says that it needs a new cat sensor and probably a new cat. There is a lound thump at the back every time I drive over a bump. The garage thinks this is a broken cat making the noise. Does this look like good advice? Should I get them to check the subframe bushes? Is there anything else that I can do to bring down the carbon monoxide reading? It has new oil, filters and sparks.

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The advice that the garage gave you seems right. If any bushes were worn they would show up on the MOT Test. Try taking it to another garage to check out the Cat for your peace of mind.

Posted on Nov 28, 2008


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