P2220 OBD II Trouble Code NOx Sensor Heater Control Circuit High Bank 2
How to quickly diagnose, repair, and causes of a P2220 diagnostic code that means there is a high voltage situation in the NOx sensor heater control circuit on bank 2.
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
Broken connector tabs (intermittent connection)
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.
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