Engine Protection System: Low Oil Pressure
The engine control unit has detected low oil pressure.
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What it means (plain English)
The engine's oil pressure is below the safe operating level, which can lead to severe engine damage if not addressed immediately.
What the computer is actually seeing
The ECU sees a voltage signal from the oil pressure sensor indicating a value below the threshold of approximately 10 PSI when the engine is running.
What a healthy reading looks like
Normal oil pressure should be between 25 and 65 PSI at idle and should increase to 55 to 75 PSI when running at higher RPMs.
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; ensure it's between the 'Min' and 'Max' marks on the dipstick. If low, top up with the correct oil type.
- 22. Inspect the oil pressure sensor's wiring and connector for damage or corrosion; repair any found issues.
- 33. Using a mechanical oil pressure gauge, test the oil pressure at the engine. It should read within 25-75 PSI depending on RPM. Record the reading.
- 44. If oil pressure is low, check for blockages in the oil passages. Clean or replace the affected components as necessary.
- 55. If the wiring and sensor are good, and the oil pressure is still low, inspect or replace the oil pump and check engine bearings.
Common causes
- Low oil level in the engine
- Faulty oil pressure sensor
- Oil passages clogged with sludge
- Oil pump failure
- Worn engine bearings
Typical repair cost
$$$
Related codes
Frequently asked questions
Is it safe to drive with this code active?
No, this is a high severity code indicating low oil pressure. Continuing to drive can cause serious engine damage.
Will this code come back if I just clear it?
Yes, if the underlying issue is not fixed, the code will likely return after a short period.
Why is this code sometimes paired with SPN 102?
SPN 102 could indicate a fault with the oil temperature sensor, which can also affect pressure readings.
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