P2216 moderate

NOx Sensor Heater Circuit Low (Bank 2)

The P2216 code means the vehicle's onboard diagnostic system has detected: NOx Sensor Heater Circuit Low (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
Extended Bank 2 sensor warm-up
Cold start emissions issues
Possible reduced power mode
Failed emissions test

Probable Causes (Ranked by Likelihood)

Open circuit in the Bank 2 NOx sensor heater wiring Very High
Failed heater element inside the Bank 2 NOx sensor High
Corroded Bank 2 heater circuit connector Moderate
Poor ground for the Bank 2 heater circuit Moderate
ECM heater control driver failure for Bank 2 Low

Step-by-Step Diagnostic Procedure

Measure voltage at the Bank 2 NOx sensor heater connector with key on
Check the heater ground circuit for continuity
Measure heater element resistance -- open reading means failed heater
Inspect connectors for corrosion or backed-out pins
Replace the Bank 2 NOx sensor if the internal heater has failed

Frequently Asked Questions

What causes low current in the Bank 2 heater circuit?

Low current is typically caused by an open circuit, such as a broken wire, failed heater element, or corroded connector that prevents current from flowing through the heater.

Can I test the heater element without removing the sensor?

Yes, you can measure resistance at the sensor connector with the sensor still installed. Disconnect the connector and measure across the heater pins with an ohmmeter.

Is the Bank 2 NOx sensor the same part as Bank 1?

On some vehicles they are identical parts, while on others they have different part numbers due to wiring length or connector differences. Always verify the part number for your specific application.