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I had the oil changed, and the filter, and oil sending unit and my 1994 Jetta III GL still is showing the oil lamp and beeping alarm on dash. It is intermittently and when it stays on for as much as ten minutes it drives by gaga... I am in a small Alaskan village and no "dealerships" here. Local mechanic is baffled too... Any one have a suggestion?? Otherwise the car has been running fine.
I THINK it has TWO oil pressure switches, one on the head and one on the oil filter flange. One grounds out when oil pressure falls too much at idle which then turns on the light, and ONE (the one on the oil filter flange I think) grounds out when the oil pressure is at a acceptable level around 2000 rpm, if oil pressure drops too much at 2000 rpm (below 14 or 18 pounds psi) it breaks connection to ground and the buzzer and light comes on....you MAY have the wrong oil pressure switch installed....With just the key on and not started,I think the one on the head is grounded to chassis. and the one on oil filter flange is NOT grounded until its started .....I hope this makes sense, I am good at fixing things but not explaining them....If the oil light comes on only at idle then maybe the switch on the head is bad or wrong one, if the oil light and buzzer comes on at around 2000 rpm the the switch on the oil flange is bad or wrong one......I would have someone check your oil pressure with a gauge just to make sure its ok....Check and see if your car has what they call a oil pressure relay...If it does then IT could be bad....
Yancey
To Yancey...where would the oil pressure on the head be located? I was not aware of there being two. the one on the flange of the oil filyter casing was ez enuf to work with... thanx. I am trying to find the head one now...
Yancey is right on about both pressure switches - and that they act opposite each other. The warning is also affected by a controller that compares the signals and the engine rpm, and the controller sometimes fails as well. The switches are cheap and do fail, so most people replace them (with the right VW part number, because of the open/close actions) before going further in troubleshooting. But measuring the pressure is the way to be sure.
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