CATALYTIC CONVERTER

1999 Volkswagen GTI

Tiny

jimbo1976

October, 5, 2010 AT 5:56 PM

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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1 Answer

Tiny

rasmataz

October, 5, 2010 AT 6:04 PM

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

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