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Engine oil red light stay on/off

(1990 Volvo 240)
in Bellingham, WA on May 13, 2011
Engine red light comes on & off. I always make sure I have enough oil in the engine. Does the red light indicate to replace engin oil sense switch. I have checked & cleaned the wire connection to the sense line. The temperature on desh seems to be fine.
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Popular Answer
on May 13, 2011
The light is to alert you that your oil pressure has fallen below 8PSI The engine must be shut down if the oil pressure fails or the engine will be damaged. That's what the light is designed to indicate.
You need to know whether it's the switch failing or the oil pressure is failing. Probably the easiest and cheapest way to figure it out is to replace the switch, which could easily be the problem. I'm assuming that you don't have an oil pressure test gauge, so if a new switch fixes the light so that it goes out and stays out when the engine is running, the oil pressure should be OK.
If the oil pressure light keeps coming on, you need to test the oil pressure. You'll need to attach a test gauge in place of the switch and see what the oil pressure really is.
on June 20, 2011
I managed to change the switch and the RED light is gone!I've had this car for 31 years and it's still running good except the rust on the body. Thank you so much for your quick response and so sorry for not getting back to you soon.
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