2000 Volkswagen Jetta Smog failed -OBD Communication Failur

Tiny
00JETTA777
  • MEMBER
  • 2000 VOLKSWAGEN JETTA
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 107,000 MILES
I'd GREATLY appreciate any feedback you all might have with any or all of these issues and what may need replacing (I really can't afford the dealership fees at VW!) I'm mainly concerned about the smog and oil pan issue, but all are of concern.

Shortly after purchasing my Jetta, I began having an issue where once I turned on the windshield wipers, every few minutes and sometimes seconds, all panel lights would come on and speedometer would go all the way down to 0, etc as everything was shutting down, but car would still run, and everything would come back up within seconds. That is one concern, though I've since passed a smog and changed battery with that issue still happening.
None of my warning dash lights are on, and I haven't put in any after market equipment, but was told when I went to be smogged this time, my stereo is being read as after market when its stock and the same one as when I passed in years previous.
There was also a period my car alarm would go off for no reason, and after a few months, that stopped.

I originally had an FOB remote which was lost so then whenever I'd open the drivers door, the alarm would go off for a short period. I was able to have a chipped key without remote made (cheaper), via the dealership and eventually, when I opened my car door, the alarm just wouldn't go off at all as it remains today. Then my trunk went through a period of popping open randomly as I was driving unless I locked it on the panel the button is on w/the gas door button.

I need to have my oil pan either retapped or replaced since Jiffy Lube stripped the plug and it's been a slow leak even with an oversized plug in it. Whew! Any help would be appreciated.
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Wednesday, September 24th, 2008 AT 5:08 AM

3 Replies

Tiny
KHLOW2008
  • EXPERT
Hi 00Jetta777,

Thank you for the donation.

The intermittent shutting down of the meters and other components could be related to the OBD communication error and solving it could solve all.

Operating the wiper affects the electrical components means it could be due to a poor ground or intermittent power supply connection. Check all groundings and the fuse box connectors.

The alarm not sounding could be due to a fuse problem too. It could also be due to a faulty siren. Are there any lights blinkinig to indicate that the alarm has been triggered?
The trunk self opening could be due to the alarm module acting up as it should be linked. Was the original FOB equipped with trunk opener?

Rethreading the oil sump plug hole is the best way but it should have enough side clearance for a bigger sized plug. Next alternative is to weld a nut extension out of the original hole.
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Friday, September 26th, 2008 AT 11:07 AM
Tiny
00JETTA777
  • MEMBER
Thank you for your response. The intermittent shutting down of the meters has been happening for some time now and I'd had a smog since then and passed. Could that still be the issue with it failing this time?

Back when the alarm did actually go off, the lights did blink too. Now since I don't have the remote, the alarm doesn't go off at all. The original FOB did also have a trunk opener on it.

An oversized oil plug was put into the stripped hole, and it still seems to be leaking. Should I just rethread it or try a larger plug?

Thanks!
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Sunday, September 28th, 2008 AT 2:52 PM
Tiny
KHLOW2008
  • EXPERT
Hi 00Jetta777,

If the intermittent meters failing is caused by power supply which is common to the PCM, you might fail the smog test due to PCM communication error.

Was wondering if the alarm control unit is causing the trunk self unlocking. It could be due to interruption in power supply as undicated by the meter failing.

You should check the wire connectors at fuse box, junctions and at battery.

Rethreading the drain plug hole for an oversized plug is the best option.
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Monday, September 29th, 2008 AT 9:36 AM

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