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206 1.0l has failed MOT. CO emission problem. Car has done 70k been well looked after by my mum and regularly serviced. I don't really want the garage ripping me off with new lambda sensor and a cat. Is there any other way so that when they do a re test it won't fail.????
 

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It is possible that the O2 sensor is faulty, but the CAT is ok. As one is often replaced with the other, it makes sense to try this (cheaper) bit first.

There are a number of Youtube clips that show how to test them - DON'T USE A TEST METER ON OHMS !
 
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