Having problems with your 2002 Volkswagen Jetta TDI ?

02 VW engine light that stays on

\015 Hello,\015\012I have an 02 VW TDI Jetta that has the engine light on.It was scanned and said the glow plug was misfiring so that was replaced.It stayed off for a few minutes then came back on.\015\012Any Ideas?\015\012It has been on for awhile.Seems to come on when the car gets put in motion.If you just turn it on and sit there it doesn't come on.\015\012Thanks\015 Posted / edited by AnonymousUser on : 22-04-2019

Answers :

You probably need to replace the glow plug harness. The contacts in the boots that connect to the glow plugs get corroded and throw off the resistance of the circuit. The controller in the VW measures whether your glow plugs are good or not by testing the resistance in the circuit. Test all the glow plugs like DickyIV1 stated and if they are all good try cleaning out the crud on the contacts in the glow plug harness. You will then either need to clear the error code or wait several trips for it to clear itself. If it never clears itself or if it comes back on after you clear it then the glow plug harness is too much of a mess. This is really common on the TDIs (mine needs to be changed but i have been putting it off and ignoring the mil light). When I first tried cleaning the harness on my car it didn't give me a problem for another year and a half. But I knew I'd eventually be changing it.
\015\012The other thing to keep in mind is that you should change out glow plugs as a set. It causes less problems in the long run since if one failed you will probably find other will soon fail and it keeps all the resistance close to the same value.
The check engine light be reset by the vw dealer by computer after the problem with glow plug problems is fixed. had this same problem, replaced all 4 glow plugs and harness, but light still on, only to find out that the light must be reset by the dealer computer.
\015\012it worked on mine after a year of trying to reset by disconecting the battery and reconecting with no success.
\015\012good look:
Repair Help & Product Troubleshooting for 2002 Volkswagen Jetta TDI

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