NOx Sensor Circuit High Input (Bank 2)
What does P2213 mean?
The P2213 code means the vehicle's onboard diagnostic system has detected: NOx Sensor Circuit High Input (Bank 2). This is a moderate severity code.
Common Symptoms
- Check Engine Light on
- Emissions test failure
- Reduced power mode
- SCR system fault
- Abnormal exhaust sensor readings
Probable Causes (Ranked by Likelihood)
- Short to voltage in Bank 2 NOx sensor wiring Very High
- Failed NOx sensor producing high signal on Bank 2 High
- Water intrusion in the Bank 2 sensor connector Moderate
- Heat-damaged wiring near exhaust components Moderate
- ECM internal circuit fault Low
Step-by-Step Diagnostic Procedure
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Read Bank 2 NOx sensor signal value -- should not be at maximum constantly
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Inspect wiring for shorts to power, especially near exhaust heat sources
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Check the connector for water intrusion or pin damage
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Disconnect the sensor and check if signal drops to confirm sensor fault
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Replace the Bank 2 NOx sensor if wiring is intact
Frequently Asked Questions
What causes a high input reading on the Bank 2 NOx sensor?
A high input reading is typically caused by a short to voltage in the wiring or an internal sensor failure that causes the output to peg at maximum voltage.
Can heat from the exhaust damage the NOx sensor wiring?
Yes, the wiring harness runs near hot exhaust components and can melt or short if the protective sheathing is damaged. This is a common cause of high circuit codes.
Should I replace both Bank 1 and Bank 2 NOx sensors together?
Not necessarily. Only replace the sensor that has confirmed failure. However, if both sensors have similar mileage and one fails, the other may not be far behind.