Question about 2002 Volkswagen Jetta TDI

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2001 jetta glow plugs only work when below 40 degrees

Our  jetta glow plug lamp comes on for a second and then turns off when outside temp is above fourty. I am thinking it is one of three temp senders at the thermostat, but can not find anywhere with the senders I have. All of the parts houses have four pin senders, but not the one male senders like our jetta has. Any suggestions?

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  • peteyboysmit Nov 23, 2008

    I have the exactl same problem with my 2002 Jetta TDI. When it gets cold over night, starts up fine and glow plugs stay on long enough, but when its in between being warm and cold the glow plug light only comes on for a split second and I have to cycle the keys about 20 times just to warm it up enough to start.



    Have you taken it to a dealer? Fixed it somehow?

  • lizzarddog Nov 30, 2008

    You can pull each glow plug out and touch the body to the negitive terminal of the battery and touch the positive to the top with a jumper.  If the plug heats up, it is good!

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If your glow plug is faulty and senses incorrect voltage or amp this will trigger your check engine light to come on. The car must be put on the computer to find out which one it is.

Posted on Nov 23, 2008

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