The computer sees an electrical fault in the injector circuit on cylinder 1. The driver may notice a misfire, rough idle and weak power.
Likely causes, most common first
- Faulty injector coil
- Open or damaged wiring
- Corroded injector connector
- Fault in the computer driver
Parts usually involved
- Fuel injector
- Injector connector
- Wiring harness
Test before you replace
Measure injector resistance, check power at the connector and swap with another cylinder to see if the fault follows.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.