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CO and Lambda fail at MOT any advice


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I have a Mk2, rev 3 1995 import.  It has failed on the CO and Lambda emissions.  It has a new cat, O2 sensor and the pipes all look ok.  It runs rather high at 1500rpm.  Can anyone suggest anything else I can try.  Proving a real headache.  

It runs absolutely fine, which makes it even more frustrating!


Thanks, Val 

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