EGR Stuck Open
The YANMAR-P042E (Yanmar) diesel fault code means: EGR Stuck Open. This is a serious severity code.
- Keep driving?
- Limited driving only
- DIY difficulty
- intermediate
- Estimated cost
- $50-$700
What Are the Symptoms of YANMAR-P042E?
- Rough idle, white smoke
What Causes YANMAR-P042E? (Most Likely First)
- Carbon holding EGR pintle open Very Likely
- Failed EGR return spring Possible
Can I Still Drive with YANMAR-P042E?
Limited driving only. YANMAR-P042E is rated serious severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
What is Yanmar code P042E?
Yanmar P042E: EGR Stuck Open.
Can I keep operating with Yanmar code P042E?
Limited operation only -- finish task then shut down.
How much does Yanmar P042E cost to fix?
Typical cost: $50-$700. Yanmar SmartAssist / YDT diagnostic software is often required.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose YANMAR-P042E?
Remove EGR valve for inspection.
Clean pintle and seat.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P042E as a generic OBD-II code)
P042E on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown:
Which Vehicles Commonly Get YANMAR-P042E?
- Yanmar SA221 / SA324 / SA424 compact tractors
- Yanmar YT235 / YT347 / YT359 compact tractors
- Yanmar LX4100 / LX4900 utility tractors
- Yanmar ViO17 / ViO25 / ViO35 / ViO45 / ViO55 / ViO80 mini excavators
- Yanmar B27-3 / B37-3 / B50-3 compact excavators
Explore More
Was this helpful?
Send this to whoever is fixing the truck — your tech, or the person asking what the fault means.