Injector Circuit - Cylinder 4
The YANMAR-P0204 (Yanmar) diesel fault code means: Injector Circuit - Cylinder 4. This is a serious severity code.
Unverified. We could not confirm this code's definition against freely available manufacturer documentation, so treat the meaning, severity and fix guidance on this page as unconfirmed. Check it against the manufacturer's service information for your exact model and serial range before acting on it. This page is kept out of search engines for that reason, and we are working through this family manual by manual.
- Keep driving?
- Limited driving only
- DIY difficulty
- intermediate
- Estimated cost
- $250-$800
What Are the Symptoms of YANMAR-P0204?
- Misfire cyl 4, rough idle
What Causes YANMAR-P0204? (Most Likely First)
- Injector wiring Likely
Can I Still Drive with YANMAR-P0204?
Limited driving only. YANMAR-P0204 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 P0204?
Yanmar P0204: Injector Circuit - Cylinder 4. This code is reported on Yanmar equipment running the described engine family.
Can I keep working with Yanmar code P0204?
Limited operation only -- finish the current task then shut down for repair.
How much does Yanmar P0204 cost to fix?
Estimated repair cost: $250-$800. Off-road diesel shop labor runs $125-$175/hr in 2026. Dealer diagnostic software (Yanmar SmartAssist / YDT) is usually required.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose YANMAR-P0204?
Ohm-test injector 4.
Check harness routing.
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines P0204 as a generic OBD-II code)
P0204 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-P0204?
- 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
- Cub Cadet Yanmar Ex3200 / Lx410 compact tractors (rebadged)
- John Deere 17G / 26G / 35G compact excavators (Yanmar powered)
- Takeuchi TB210R / TB216 / TB230 mini excavators (Yanmar powered)
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