NOx Sensor Circuit Bank 2
P2213 indicates the NOx (nitrogen oxide) sensor circuit on Bank 2 is not responding within expected parameters. This sensor monitors emissions levels, and when the ECM detects a malfunction in its signal, this code is set. The vehicle will typically remain driveable but emissions control is compromised.
What You Might Notice
- Check engine light illuminated
- Reduced fuel economy
- Rough or erratic idle
- Increased exhaust emissions or excessive smoke
- Possible reduced engine performance
Most Common Causes
- 1
Defective or damaged NOx sensor
The NOx sensor itself may be faulty, contaminated with soot, or internally damaged. Sensor degradation is the most common cause of this code.
- 2
Wiring or connector issues
Damaged wiring harness, corroded connectors, or loose connections between the NOx sensor and ECM can prevent proper signal transmission.
- 3
ECM or module malfunction
Internal issues within the engine control module or related emissions control modules may fail to properly read the NOx sensor signal.
- 4
Exhaust system contamination
Excessive soot, carbon buildup, or debris in the exhaust near the sensor pickup can interfere with sensor operation and signal accuracy.
How to Diagnose It
- 1
Check Defective or damaged NOx sensor — The NOx sensor itself may be faulty, contaminated with soot, or internally damaged. Sensor degradation is the most common cause of this code.
- 2
Check Wiring or connector issues — Damaged wiring harness, corroded connectors, or loose connections between the NOx sensor and ECM can prevent proper signal transmission.
- 3
Check ECM or module malfunction — Internal issues within the engine control module or related emissions control modules may fail to properly read the NOx sensor signal.
- 4
Check Exhaust system contamination — Excessive soot, carbon buildup, or debris in the exhaust near the sensor pickup can interfere with sensor operation and signal accuracy.
How to Fix It
- 1
Inspect and replace NOx sensor Bank 2
Visually inspect the sensor for damage, corrosion, or soot buildup. If damaged or contaminated, replace the NOx sensor. This resolves the majority of P2213 codes.
- 2
Check wiring and connectors
Inspect the sensor harness and connector for damage, corrosion, or loose connections. Repair or replace any damaged wiring and reseat connectors firmly.
- 3
Clean exhaust and sensor area
Remove excess soot and carbon buildup around the NOx sensor area in the exhaust. Use approved cleaning methods to restore proper sensor function without damaging it.
- 4
Diagnose and reprogram ECM
If sensor and wiring are functional, the ECM or emissions control module may require reprogramming or replacement. This requires professional diagnostic equipment and should be performed by a qualified technician.
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