P22AA

NOx Sensor Heater Sense Circuit Intermittent Bank 1 Sensor 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine light comes on
Increased emissions of harmful substances
Reduced engine power
Unstable engine idling
Possible transition to emergency mode

Causes

Open or short circuit in NOx sensor heating circuit
NOx sensor malfunction
Problems with the wiring harness or connectors
Engine control unit malfunction
Corroded contacts or damaged wiring

How to Fix

Check the continuity of the NOx sensor heating circuit
Inspect connectors and wiring harness for damage
Check the resistance of the sensor heating element
If necessary, replace the NOx sensor
Check and update engine control unit software

Related codes

P2200 P2201 P22AB