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hello all i have a 2002 jetta and glow plug #4 has a bad cirect changed out the plugs and still have the check engine light on i want to change out the harness and relay too just so it can be all new the car has 204000 miles on it, it still is all stock i dont now if i am just putting in money at the wrong places any help would be great thanks for your time
 

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Did you clear the code with a scan tool such as VCDS (Vag-Com) or a generic scanner? The Check Engine light won't go out by itself... If the CEL comes back, then you should try cleaning out the inside of the harness before replacing...

Yuri
 
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