I have an 1988 Audi 80 quattro. When slowing down, the oil pressure warning
light on the dash comes on and there is a beeping. When I stop, the light
goes off and the beepings stops. Our service technician has checked and
says it is not the sensor or oil pump. Claims it is the engine. This
doesn't make sense to me absent any sign of an oil leak.
Does anyone have any thoughts?
Might just be a sensor but if not I'd say you might be looking at either a
failing oil pump or possibly a sludged engine causing a blocked oil pump
Dropping the oil pan will tell you. That said, I don;t know how easy that is
on an 80 - it might or might not be simple. On an A4 its a bear of a job.
Have you been doing regular oil & filter changes? How many miles has this
thing done & how clean is the oil in it?
Might be that it needs a treatment of this : www.auto-rx.com
Bottom line is that low oil pressure (assuming this is not a sensor fault)
suggests a lack of oil circulating the engine which will lead to failure
fairly rapidly. If you want to keep the thing you need to get it fixed.
Your tech is aware that the two sensors work oppositely, i.e. one is
normally open, and the other is normally closed?
If the sensors are OK, you only have three options left:
1. The oil pressure warning controller is bad.
2. The wiring from pressure sensors to the controller is bad.
3. You actually have low oil pressure.
- Disconnect the wire from the high pressure sensor.
- Connect the wire to ground and take a test drive.
If the beeping still happens, your problem is with the controller or
its wiring. If the beeping goes away, you most likely have an oil
pressure problem which could cause serious engine damage.
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