Engine Oil Pressure Sensor Circuit Low
The engine oil pressure sensor has detected low oil pressure.
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What it means (plain English)
Your engine oil pressure is too low, which can mean you're running out of oil or the oil isn't circulating properly.
What the computer is actually seeing
The engine control unit (ECU) sees a voltage reading from the oil pressure sensor below its normal operating range, typically around 0.1 volts (low pressure situation), whereas normal operating pressure should be around 0.5 to 4.5 volts depending on engine speed and temperature.
What a healthy reading looks like
Normal oil pressure readings should be between 25-60 PSI (or 0.2-0.4 volts for the sensor) at idle when the engine is at operating temperature.
Guided diagnostic — the DiagCoach way
Don't just throw parts at it. Walk through these in order — each step tells you whether to keep going or stop and fix what you found.
- 11. Check the oil level; it should be between the minimum and maximum marks on the dipstick. If oil is low, add the correct type.
- 22. Inspect the oil pressure sensor wiring and connectors for damage or disconnections. Repair as necessary.
- 33. Start the engine and check for oil pressure using a mechanical gauge; readings should be 25-60 PSI at idle.
- 44. If oil pressure is still low, inspect the oil pump for functionality and check the oil filter for clogs.
- 55. Replace the oil pressure sensor if all other components are functioning correctly and there is still a fault.
Common causes
- Low oil level
- Faulty oil pressure sensor
- Oil pump failure
- Clogged oil filter
- Oil viscosity too thick for temperature conditions
Typical repair cost
$$ - $$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
No, low oil pressure can lead to engine damage; address it immediately.
Will this code return after resetting?
It may return if the underlying issue isn't fixed, like low oil or faulty hardware.
Why does this code sometimes appear with SPN 5?
Both codes relate to oil pressure; if one is low, it can trigger the other.
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