NOx Sensor Circuit (Bank 2)
The P2210 code means the vehicle's onboard diagnostic system has detected: NOx Sensor Circuit (Bank 2). This is a moderate severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- hard
- Estimated cost
- $300 - $800 (parts and labor)
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Common Symptoms
- Check Engine Light on
- Failed emissions test
- Possible reduced power
- SCR system warning light
- Increased NOx emissions
Probable Causes (Ranked by Likelihood)
- Failed NOx sensor on Bank 2 Very High
- Damaged wiring or connector to the Bank 2 NOx sensor High
- NOx sensor heater circuit failure on Bank 2 Moderate
- CAN bus communication fault with the Bank 2 sensor module Moderate
- Contaminated sensor from exhaust system issues Low
Step-by-Step Diagnostic Procedure
-
Read NOx sensor Bank 2 values with a scan tool and compare to Bank 1
-
Inspect Bank 2 NOx sensor wiring and connector for damage
-
Test the sensor heater circuit for proper operation
-
Check CAN bus communication between the sensor and ECM
-
Replace the Bank 2 NOx sensor if all wiring checks pass
Frequently Asked Questions
Why are there NOx sensors on both banks?
On V-configuration diesel engines or systems with dual SCR catalysts, separate NOx sensors monitor each exhaust bank independently to ensure proper emissions control.
Can I replace just the Bank 2 sensor?
Yes, you only need to replace the sensor that is faulty. However, if both sensors are at similar mileage, some technicians recommend replacing both at the same time.
Is P2210 the same as P2200 but for Bank 2?
Yes, P2200 covers the Bank 1 NOx sensor circuit and P2210 covers the Bank 2 NOx sensor circuit. The diagnostic approach is the same but on the opposite exhaust bank.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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