The oil pressure warning light does not come on after the ignition is switched on
Faulty oil pressure sensor
Turn on the ignition, disconnect the wire from the oil pressure sensor and connect to «mass» (-). If the control lamp lights up, replace the sensor.
The oil pressure sensor is not receiving power due to oxidation of the contacts
Check the wire and contacts.
Warning lamp defective
Replace light bulb.
Oil pressure warning light does not go out after starting the engine
Too hot oil
Ignore if the warning light goes out when you press the accelerator.
Warning light does not go out when the accelerator pedal is pressed or remains on while driving
Too low oil pressure
Check the oil level. Refill if necessary. Check that the oil pressure is correct according to the vehicle manual.
Wiring to oil pressure regulator shorted to housing
Disconnect the wire from the oil pressure sensor and set aside (To «mass» (-) don't bring). Turn on the ignition. If the warning light comes on, check the wiring.
Faulty oil pressure sensor
Replace regulator.
Too low oil pressure over the entire engine speed range
Too little oil in the engine
Add oil.
Clogged strainer in the oil pick-up pipe in the sump
Remove the oil pan, clean the strainer, replace if necessary.
Faulty oil pump
Remove and check the pump. Replace if necessary.
Crankshaft bearing shell defect
Remove the engine.
Too low oil pressure in the lower engine speed range
Reducing valve stuck open due to contamination
Remove and check the valve.
Too high oil pressure at engine speeds above 2000 rpm
Reducing valve does not open due to contamination
Remove and check the valve.
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