1999.5 Jetta with 2.0 AEG engine Oil pressure light buzzer problem

HIGHMONTI

MEMBER
1999 VOLKSWAGEN JETTA
69,000 MILES

1999.5 Jetta with 2.0 AEG engine

Car had been sitting for last yr in garage. Jumped started, and began using.
Oil Pressure light/buzzer started coming on.

Was bringing in for service anyway – local shop- German oriented– not dealer. Checked car out fully, no leaks, etc, changed oil and changed oil pressure switch. Buzzer/Light still coming on.
Brought back in and he dropped oil pan and cleaned pick up screen – said it was 40% blocked. Pressure tested with gauge and pressure was fine.
Light came back on after 1 day.

Brought in again – replaced pressure switch 2nd time and tested pressure again, was fine. Flushed oil again. Road tested – no problem.

One day later. Buzzer and light comes on again.
The light and buzzer come on after 3000RPM, initially, come to stop sign and goes off, then back on again on 3000RPM. Once car is warmed up, will usually NOT go off at stop sign. If I shut off engine, and turn on, Buzzer/light comes on at 2000+RPM. And stays on. Sometimes it does go off at low RPM, sometimes not. Intermittent

Next – disconnected pressure switch and wired to ground – Worked fine for 1 day, then same problem with Buzzer/light.

What does system work for a day, then act up?
Do I have a bad wire? How to track down?
Is it the cluster? (Why?) Can I disable the light and buzzer in the cluster?
Any ideas greatly appreciated.

3 Replies

EXOVCDS

MECHANIC
1,883 POSTS

If the light and buzzer come on when the wire is grounded. Then you have a wiring / electrical problem.

I would connect a scan tool, access the "Instrument Cluster" Module and watch oil pressure input in one
of the measuring blocks (value will be OK / Not OK)

I would also connect a mechanical pressure gauge and monitor from cold till warm to see "actual" pressure
when the problem occurs.

Could be an issue with the pressure relieve valve in the oil filter bracket (the metal bracket that the oil
filter mounts up against).

Thomas

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Tuesday, September 24th, 2013 AT 5:00 PM

MADMIKE1735

MECHANIC
951 POSTS

The oil pump screens on these clog. And that is the most common for low oil pressure. It can be repaired by dropping the oil pan, and removing the sump screen. My money is on the screen being clogged. Ive seen it many times.

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Tuesday, September 24th, 2013 AT 7:46 PM

MADMIKE1735

MECHANIC
951 POSTS

I was cut off in first message. I know they said they dropped pan. And checked screen. However, if all they cleaned was the screen, its probably clogged again. As far as pressure testing the screen? Ive never ever seen that done. I would love to know how it was done. Do you recall how they are flushing your oil? Are they just pouring in a chemical (more than likely its kerosene) or are they actually performing an engine flush with a BG machine? The problem these sludge up so bad, is they come with synthetic oil, and go 5000, to 7500 between oil changes. Well thats fine. But when someone uses regular oil, and goes the same interval, the oil turns to a nasty gunk.

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Tuesday, September 24th, 2013 AT 7:52 PM