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Hey Guys,

Upon startup of the car, the check engine light DOESNT come on. It only comes on while driving. Anyone ever experience this problem? I wanna say its because of fuel/air ratio, but im not entirely sure.

Any ideas?
 

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Have you tried checking for codes?

Also, this is a tech section question, for whichever generation you might be talking about.

If it's a MKIV, there are problems with a couple of cold solder joints in the car that cause lights to act up. One of them is in the dash, and it keeps the /!\ brake light illuminated, another keeps the taillights from working as driving lights. Try putting your key in the on position and tapping the dash. If this gets the CEL to light up, at least sometimes, then that is your problem.
 
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