P22A4

NOx Sensor Heater Control Circuit Low Bank 1 Sensor 2

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$167–444 (est.)

Symptoms

Check Engine light comes on
Deterioration of vehicle dynamics
Increased fuel consumption
Dips during acceleration
Unstable engine idling

Causes

NOx sensor malfunction
Open or short circuit in the heating circuit
Poor contact in the sensor connector
Wiring harness damage
Engine control unit malfunction

How to Fix

Check the continuity of the NOx sensor heating circuit
Check the resistance of the sensor heating element
Inspect connectors and wiring harness for damage
If necessary, replace the NOx sensor
Reset the error and check the system operation

Related codes

P2200 P2201 P229F