P2203

Symptoms

• Check Engine Light Is On
• Reduced engine power
• Increased fuel consumption
• Unstable engine idling
• SCR errors (if this system is installed)

Causes

• NOx Bank 1 Sensor 1 malfunction
• Open or short circuit in the sensor circuit
• Connection problems or connector corrosion
• ECM malfunction
• Real NOx levels exceeded due to problems with the SCR or EGR system

How to Fix

1. Check the integrity of the NOx sensor wiring and connectors
2. Check the power supply and grounding of the sensor circuit
3. Compare sensor readings with reference values
4. If necessary, replace the NOx sensor
5. Check the functionality of the SCR system (if installed)

Related codes

Error P2203 by Vehicle Brand