Question about 2002 Volkswagen Jetta TDI
I 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.
It 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.
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.
The 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.
Posted on Sep 13, 2008
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.
it worked on mine after a year of trying to reset by disconecting the battery and reconecting with no success.
Posted on Oct 11, 2008
I changed the bad plug and had the code reset and she ran fine since than .
I had to have the harness changed in 2005 since it was lighting up as "bad" and VW did it for me. So I don't know if that was really necessary since the same code was on in 2005 as it was a few weeks ago .They try to make money I guess.
So measure your resistance and change the bad plug and take it from there.Stay with the same brand Bosch or Beru do NOT mix.
Hope that helped
Posted on Sep 13, 2008
If you get a trouble code on a VW it is fairly easy to get information about it by googling "vw trouble code (eg) 0673". Some of these pages will tell you that the code refers to a glow plug fault on cylinder #3. Others will tell you that the cylinder order is sometimes reversed, so if the code is 0671, meaning glow plug open or short circuit on cyl#1, it might be cyl#4 which has the problem. All you need to do is to measure the resistance of the glow plug with the power cable removed. It should be about 1 ohm if the plug is good. You will only need to remove the plug from the engine if the plug is defective.
Hope this helps you a bit. D
Posted on Aug 14, 2008
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Posted on May 11, 2014
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