Question about 1996 Volkswagen Jetta
First off do you know when the CO was too high? was it at idle or accelerating? The mass air flow sensor adjusted the mixture based off of readings. I would take it all apart and clean everything. Also your front o2 sensor may need to be replaced as well.
1) take the intake hose off of the throttle body, and air mass meter. Clean this completely with carburetor cleaner.
2) remove mass air meter from air filter housing, and clean this also
3) clean throttle body completely with carb cleaner and a soft brush
4) check integrity of the entire PCV system from where it clips onto the box on the front of the engine block, up through the diaphragm on the valve cover and the hose leading to the intake tract. All are likely in need of replacement.
Posted on Aug 26, 2010
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Posted on Jan 02, 2017
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