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Vw golf Mk4 1.8 20v Gti failed mot emissions test?

My golf failed on emissions CO =0.49 at 2650rpm (fast idle) but passed rest of emissions test?? could this be a sensor problem rather than replacing Cat??
Jim, October 2010
buy a bottle of cataclean from your nearest motor factors and follow the instructions on it to clean cat and pass the emissions test

hope this sorts your problem, October 2010
link Click here to see other fixes for Golf.