Engine Oil Pressure Sensor Circuit Low
Indicates low oil pressure in the engine.
Heads up: this code wasn't in our hand-written library yet, so DiagCoach AI built this page on the fly. Double-check critical specs against service info before condemning parts.
What it means (plain English)
Inside the engine, an oil pressure sensor measures how well oil is circulating. If the pressure drops too low, it can cause engine parts to wear out faster or even seize up.
What the computer is actually seeing
The sensor outputs voltage values that should be between 0.5V to 4.5V depending on the actual oil pressure but sees less than 0.3V.
What a healthy reading looks like
Normal oil pressure should be between 25 to 65 PSI at hot idle, depending on the engine.
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; should be between the low and high marks on the dipstick. If low, top up and recheck the code.
- 22. Inspect wiring and connector to oil pressure sensor for damage or corrosion. Repair as necessary.
- 33. Using a scan tool, check live data from the oil pressure sensor. Voltage should read between 0.5V and 4.5V. If below 0.3V, continue diagnostics.
- 44. Perform a mechanical oil pressure test with a gauge. Compare reading to normal specifications (25 to 65 PSI).
- 55. If mechanical gauge reads normal but sensor voltage is low, replace the oil pressure sensor.
Common causes
- Oil level too low
- Faulty oil pump
- Blocked oil passages
- Bad oil pressure sensor
- Wiring issues with the oil sensor
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code?
No, the low oil pressure can lead to severe engine damage. Fix this immediately.
Will the code come back after clearing?
If the underlying issue is still present, the code will likely return.
Why is this code paired with SPN 1559?
SPN 1559 indicates an invalid signal from the oil pressure sensor, which often accompanies low pressure readings.
Working a real vehicle right now?
Let DiagCoach walk you through it live with your specific symptoms, vehicle, and what you've already checked.
Start guided diagnostic →