Mechanics

CATALYTIC CONVERTER

1999 Volkswagen GTI

Engine Performance problem
1999 Volkswagen GTI 4 cyl Front Wheel Drive Manual 90,000 miles

Failed Mot on CO =0.49 @2650rpm (fast idle) but passed rest of emissions test? Could this be sensor rather than a cat replacement?
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Jimbo1976
October 5, 2010.



Could be a defective coolant temperature sensor or the oxygen sensor that's causing the carbon monoxide to go high

Rasmataz
Oct 5, 2010.