Engine Oil Pressure Sensor 1
Indicates a problem with the engine oil pressure sensor signal.
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What it means (plain English)
The engine oil pressure sensor is sending a signal that the oil pressure is outside the normal range, either too low or not responding properly.
What the computer is actually seeing
The engine control module (ECM) expects the oil pressure signal to fluctuate between 0.5V (low pressure) and 4.5V (high pressure) under normal operating conditions. A constant voltage below 0.5V or above 4.5V triggers this fault.
What a healthy reading looks like
Normal oil pressure values from the sensor should be between 1 PSI to 80 PSI when the engine is hot, corresponding to a signal of about 0.5V to 4.5V.
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 engine oil level. Add oil if low, ensure it’s clean and at the correct level. If the problem disappears, there's your issue.
- 22. Inspect the wiring and connector to the oil pressure sensor for damage or corrosion. Repair as necessary and retest.
- 33. Use a multimeter to measure the voltage at the sensor connector. Should be between 0.5V and 4.5V with the engine running.
- 44. If the voltage is outside expected range, replace the oil pressure sensor and recheck.
- 55. If the sensor is good, test the oil pressure manually using a mechanical gauge. If low, investigate engine oil pump, cavitation, or internal engine problem.
Common causes
- Faulty engine oil pressure sensor
- Wiring issues or poor connections
- Low oil level or dirty oil
- Engine oil pump failure
- ECM software issues
Typical repair cost
$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
It's not recommended to drive as low oil pressure can lead to engine damage.
Will the code come back after resetting?
If the underlying issue isn’t fixed, the code will likely come back.
Why does this code appear with low oil pressure?
The sensor detects low oil pressure, triggering this code as a failure.
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