1999 Volkswagen GTI Catalytic converter

1999 VOLKSWAGEN GTI
90,000 MILES • 4 CYL • FWD • MANUAL
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JIMBO1976
  • MEMBER
  • 1 POST
Failed Mot on CO =0.49 @2650rpm (fast idle) but passed rest of emissions test?? could this be sensor rather than a cat replacement??
Oct 5, 2010 at 10:56 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,992 POSTS
Could be a defective coolant temperature sensor or the oxygen sensor that's causing the carbon monoxide to go high
Oct 5, 2010 at 11:04 AM
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