Symptoms of P2220 OBD II Trouble Code
- Failed emissions test
- Intermittent CEL (check engine light)
Common Causes of P2220 OBD II Trouble Code
- NOx sensor defective
- Heater in NOx sensor malfunctioning
- Internal open in ECM (Engine control module) or NOx sensor itself
- Water intrusion
- Broken connector tabs (intermittent connection)
- Melted harness
- Dirty sensor element
- High resistance present in heater control circuit
Severity of P2220 OBD II Trouble Code
Medium severity for this, as emission related faults really can effect the environment around this. That said, sometimes with emission faults, there will not be any symptoms present but can still have repercussions if left unattended.