P2203 OBD II Trouble Code NOx Sensor Circuit High Bank 1

How to quickly diagnose, repair, and info on symptoms and causes of a P2203 code that indicates a detected high voltage condition in the NOx sensor circuit on bank 1.

Symptoms of P2203 OBD II Trouble Code

  • Increased hydrocarbon emissions
  • Check engine light illuminated
  • Fuel economy not consistent
  • Erratic Idle
  • Excessive smoke

Common Causes of P2203 OBD II Trouble Code

  • Defective or damaged NOx sensor
  • Dirty sensor pickup
  • Damaged wiring
  • Internal ECM issue
  • Connector problem

Severity of P2203 OBD II Trouble Code

Most times, I would say, emission related codes will be fairly low on the severity scale. Especially comparing to some possible hazards in other systems on the vehicle like steering, suspension, brakes, etc. Point being here is that if you have bigger fish to fry, so to say, you can put this on the back burner for now. That said, any electrical fault should be attended to with a certain sense of urgency.