Yanmar Marine Exhaust Elbow Over-Temp Alarm
The YANMAR-MARINE-EXHAUST-TEMP (Yanmar) diesel fault code means: Yanmar Marine Exhaust Elbow Over-Temp Alarm. This is a critical severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- advanced
- Estimated cost
- $100-$2,000
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Common Symptoms
- Exhaust temp alarm
- Steam, possible melted exhaust hose
Probable Causes (Ranked by Likelihood)
- Raw water mixer flow loss (impeller problem) Very Likely
- Corroded / blocked exhaust riser Likely
Step-by-Step Diagnostic Procedure
Shut down immediately.
Check raw water flow at strainer.
Inspect riser for internal rust scale blockage.
Frequently Asked Questions
What is Yanmar code MARINE-EGT-HIGH?
Yanmar MARINE-EGT-HIGH: Yanmar Marine Exhaust Elbow Over-Temp Alarm. This code is reported on Yanmar equipment running the described engine family.
Can I keep working with Yanmar code MARINE-EGT-HIGH?
Do not continue operating. Risk of engine damage or unsafe shutdown.
How much does Yanmar MARINE-EGT-HIGH cost to fix?
Typical repair cost: $100-$2,000. Off-road diesel shop labor runs $125-$175/hr in 2026. Dealer diagnostic software (Yanmar SmartAssist / YDT) is usually required.