Low Oil Level:
* Insufficient oil: This is the most obvious cause. Check your oil level using the dipstick. If it's low, add the correct type and amount of oil specified in your owner's manual. However, do not drive the car until you've addressed the underlying reason for the low oil.
Oil Pressure Problems:
* Low oil pressure: This could be due to several factors:
* Worn-out oil pump: The pump may be failing to circulate oil effectively.
* Clogged oil filter: A clogged filter restricts oil flow. Change the oil and filter immediately.
* Worn engine bearings: Worn bearings allow oil to leak past them, reducing pressure. This is a major engine problem.
* Leaky oil seals or gaskets: Leaks reduce the overall amount of oil in the system.
* Blocked oil passages: Internal engine components may be partially blocking the flow of oil.
* Faulty oil pressure sending unit: While less likely to be the sole cause of a constant oil light, a faulty sensor can give a false reading. However, if the engine is making unusual noises or behaving strangely, it's unlikely to be only the sensor.
Other less likely possibilities:
* Wiring or electrical problems: A short circuit or faulty wiring in the oil pressure sensor circuit could trigger the light.
* Faulty oil pressure sensor: As mentioned above, a faulty sensor can cause the light to come on even if oil pressure is fine.
What to do:
1. Do not drive the car until you've identified and addressed the cause. Driving with low oil pressure will quickly ruin your engine.
2. Check the oil level immediately.
3. Check the oil pressure: If you have a gauge, this will confirm whether it's actually low.
4. Change the oil and filter: This is a relatively inexpensive and easy fix that might solve the problem.
5. If the light stays on after changing the oil and filter, have a qualified mechanic diagnose the problem. It's likely a more serious issue requiring professional attention.
Ignoring the oil light could lead to catastrophic engine damage, resulting in costly repairs or even a complete engine replacement. It's crucial to address this issue promptly.
