Yanmar Marine Low Oil Pressure Alarm
The YANMAR-LOW-OIL-PRESSURE (Yanmar) diesel fault code means: Yanmar Marine Low Oil Pressure Alarm. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- intermediate
- Estimated cost
- $10-$5,000
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Common Symptoms
- Oil pressure alarm / buzzer at helm
- Automatic shutdown on newer 4LV/8LV engines
Probable Causes (Ranked by Likelihood)
- Low oil level (check at rest on level keel) Very Likely
- Fuel dilution in oil (short-trip diesels) Likely
- Failed oil pressure switch / sender Possible
- Worn oil pump or bearings Less Likely
Step-by-Step Diagnostic Procedure
Shut down immediately.
Check oil level when hull is on level.
Mechanical gauge on oil galley port to verify actual pressure.
Send oil sample for analysis if contamination suspected.
Frequently Asked Questions
What is Yanmar code MARINE-LOW-OIL?
Yanmar MARINE-LOW-OIL: Yanmar Marine Low Oil Pressure Alarm. This code is reported on Yanmar equipment running the described engine family.
Can I keep working with Yanmar code MARINE-LOW-OIL?
Do not continue operating. Risk of engine damage or unsafe shutdown.
How much does Yanmar MARINE-LOW-OIL cost to fix?
Typical repair cost: $10-$5,000. Off-road diesel shop labor runs $125-$175/hr in 2026. Dealer diagnostic software (Yanmar SmartAssist / YDT) is usually required.