Code
P0203
Fuel / Injectors
Injector circuit malfunction — Cylinder 3
The fuel injector on cylinder 3 has an electrical fault.
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Most likely causes
- Faulty injector
- Wiring or connector fault
Symptoms you may notice
- Rough idle
- Misfire
- Check engine light
Checks to run
- Test injector resistance
- Check power and ground
Tools you may need
Multimeter
Noid light
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.