P2212 moderate

NOx Sensor Circuit Low Input (Bank 2)

The P2212 code means the vehicle's onboard diagnostic system has detected: NOx Sensor Circuit Low Input (Bank 2). This is a moderate severity code.

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Keep driving?: Yes, but fix soon
DIY difficulty: hard
Estimated cost: $250 - $800 (parts and labor)

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Common Symptoms

Check Engine Light on
Emissions failure
Possible limp mode
SCR warning indicator
Inaccurate NOx monitoring

Probable Causes (Ranked by Likelihood)

Open circuit in Bank 2 NOx sensor wiring Very High
Failed NOx sensor producing low signal on Bank 2 High
Corroded connector at the Bank 2 NOx sensor Moderate
Ground fault in the Bank 2 sensor circuit Moderate
ECM internal circuit fault for Bank 2 Low

Step-by-Step Diagnostic Procedure

Check Bank 2 NOx sensor signal voltage -- should not be near zero at operating temperature
Inspect wiring from the Bank 2 sensor to the ECM for opens
Clean or replace the connector if corrosion is found
Test the ground circuit for proper continuity
Replace the Bank 2 NOx sensor if wiring is intact

Frequently Asked Questions

What does low input mean for the Bank 2 NOx sensor?

Low input means the signal from the Bank 2 NOx sensor to the ECM is below the minimum threshold, usually due to an open wire, bad ground, or failed sensor.

Is the Bank 2 NOx sensor in the same location on all vehicles?

No, Bank 2 location varies by vehicle. On V-engines it is the cylinder bank opposite cylinder 1. Consult your service manual for the exact location.

Can I drive with P2212 without immediate repair?

You can drive, but the SCR system cannot properly monitor and control NOx emissions on Bank 2. Some vehicles may enter limp mode, and you will fail emissions testing.