OBD codes / P0203

P0203

Moderate

Injector Circuit/Open - Cylinder 3

Get it looked at soon to avoid further wear.

Likely causes

  • faulty injector
  • wiring or connector fault

Common fixes

  • test the cylinder 3 injector and wiring
  • replace the injector if open

Seeing P0203 on your car? Get a diagnosis specific to your exact year, make and model.

Diagnose P0203 for my vehicle

Generic OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.