Here are the most likely culprits:
* Failing Oil Pressure Sensor: This is the most hopeful scenario. A faulty sensor might be sending intermittent incorrect readings. Replacing the sensor is relatively inexpensive, but you *must* still address the possibility of underlying oil pressure issues. Don't assume a new sensor fixes everything.
* Low Oil Level: Check your oil level immediately! Low oil is a major cause of low oil pressure and could lead to catastrophic engine damage. If low, add oil (the correct type and amount) and check again. However, if the level is low, it points to a leak somewhere in the system – another serious problem.
* Worn Oil Pump: The oil pump is responsible for circulating oil. With high mileage, the pump can wear out, reducing its ability to generate sufficient pressure. This is a major repair.
* Worn Engine Bearings: Low oil pressure can be a symptom of worn engine bearings. This is a very expensive repair, potentially requiring engine rebuild or replacement. The metal-to-metal contact creates the reduced pressure, and the blinking light is the warning sign.
* Clogged Oil Filter or Pickup Screen: A clogged oil filter or pickup screen restricts oil flow, leading to reduced pressure. Changing the oil filter is a quick and inexpensive check. The pickup screen requires more disassembly.
What to do immediately:
1. Stop driving the car immediately. Continuing to drive with a blinking oil pressure light risks serious and irreversible engine damage.
2. Check the oil level. Add oil if necessary *only after verifying the engine is cool*.
3. Have the car towed to a qualified mechanic. Do not attempt to drive it any further.
A mechanic will need to diagnose the exact cause of the low oil pressure. They will likely check the oil pressure using a gauge, inspect the oil pump, check the oil filter and pickup screen, and assess the condition of the engine bearings. Ignoring this problem will almost certainly result in engine failure.
