P22A9

NOx Sensor Heater Sense Circuit High 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 Is On
Reduced engine power
Increased fuel consumption
Unstable engine operation
Will not pass toxicity testing

Causes

NOx sensor heater circuit open
Short circuit in the sensor circuit
Faulty NOx sensor
Damage to wiring or connectors
Problems with the engine control unit

How to Fix

Check the continuity of the sensor heater circuit
Inspect connectors and wiring for damage
Check the power and ground of the sensor circuit
Replace NOx sensor if necessary
Check and update the ECU firmware if necessary

Related codes

P22A8 P220A P220B