P1203 Possible Causes
- Ignition spark
- Check primary and secondary ignition
- Check the fuel supply system
- Fuel pressure and injector
- Check for vacuum leaks
- Check the mechanical condition of the engine
How is P1203 code repair done?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Engine light on (or engine warning light soon to come on)
P1203 Meaning
Fuel system malfunction caused by cylinder #3 misfire is the generic description for code P1203, but the manufacturer may have a different description for your vehicle model and year. Currently, we have no further information about OBDII code P1203.