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Hi,
Im driving a european spec '02 Passat engine model is the 2L 20v(51000miles). Just 2 days ago I changed oil airfilter an plugs on it. I noticed after it the idle was a bit off as it was hunting up and down. It was running perfect though nice crisp responce no hesitation during acceleration, basically it was running fine. But just today an engine light poped up and it was a fault 21 so refering to the manual it said if the light is blinking "damaged catalyst due to misfire" or if the light is staying on which it is "fault which reduces quality of exhaust gases". Have any of you guys any idea of what this could be, and if it is safe to drive it? And even since the code the idle is still hunting but runs perfect really...
Thanks Brian
 
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