Question about 2003 Volkswagen Jetta TDI

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It has come on three times in the last week. Each time, I take it to my VW certified mechanic. He runs the diagnostic machine. It returns a error code on a glow plug, but when he checks the glow plug, it is functioning normally. So he resets the computer. It drives fine for a few days without the MIL lighting up, but then it lights up again. I'm getting tired of this ritual.

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Replace the glow plug as they get older they carode and will short under different condtions and may be shoing low voltage, and when it sets a code for the check enginge light three times the light comes on Just replace it, if it goes out it could damage your engine, this is one of those times testing does no good you have to remove it to look at it, I am a diesel truck mechanic and run into this all the time Please rate my answer for my tiem. Thanks avid101

Posted on Jul 29, 2009

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Problem is related to your timing belt replaced. have you ever had it replaced?.

If the timing is slightly off the check engine light would turn off not matter what you do. It will keep giving a glow plug error.

Posted on Jul 29, 2009

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