1990 VW Cabriolet oil pressure light/sensor issue

Asked by Jul 26, 2015 at 09:15 PM about the 1990 Volkswagen Cabriolet

Question type: Maintenance & Repair

I bought a 1990 VW Cabriolet with some issues today. oil light and buzzer go off when
car revs past 2000rpm. I replaced both sensors and fixed nothing. could it be my oil
pump? I also noticed that the bar gauge  maxes out when i start the car and stays that
way while driving. the low pressure sensor on the head has a blue and black wire with
a rubber cap attached and the high pressure sensor on the oil filter flange has a
yellow... seems opposite to all the photos im looking at. thanks

8 Answers

4,955

Be sure you don't have the sensors swapped...they look very similar. This is a common issue with the Mk2 oil pressure sensor circuit...if you're handy, you can install a tee and oil pressure gage to verify pump performance.

i think i have them right. the sensor off the head is blue and the lower one is white.

i will post pictures tonight.

4,955

http://www.partscats.info/volkswagen/en/? i=cat_vag_models&brand=vw&number=1685&set=1697&ein=1990&f=44 &hauptgr=1234567890&hg=9&grf=021110013&bf=21110&hgug=919&ug= 19&parent_id=246888&detail_id=246890

4,955

Upper sensor is the low pressure: 028 918 081D Lower sensor is the high pressure: 056 919 081E Some diagrams show both a high and low switch up on the head assembly...hopefully, you have a maintenance manual.

i feel like the wiring is wrong. i think the previous owner tried to change the sensors and mixed the connections up there is one wire not even connected to anything.

hey thanks for all the help! I'm being told i have the wrong low pressure sensor by these guys. http://forums.vwvortex.com/showthread.php?7224216-1990-VW- Cabriolet-oil-pressure-light-sensor-issue&p=88054064

hey I need help, I have a 1986 vw cabby the idle boost valve is cracked, the heater doesn't switch between gauges, heat not hot. starts fine but have to keep my foot on the gas until car warmed up alittle. bar guage all the way to the end. and my oil light flashes at me when I let off the gas can u help? I love my lil car

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