P22A3

NOx Sensor Heater Control Circuit/Open 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
Reduced engine power
Increased fuel consumption
Increased emissions of harmful substances
Possible starting problems in cold weather

Causes

Open circuit in the NOx sensor heater power supply circuit
Malfunction of the NOx sensor itself
Damage to the wiring harness to the sensor
Poor contact in the sensor connector
Faulty heater circuit relay or fuse

How to Fix

Check the integrity of the fuses and relays of the heater circuit
Inspect the sensor wiring harness and connectors for damage.
Check sensor heater resistance
If necessary, replace the NOx sensor
Clear the error and check if it returns

Related codes

P22A4 P2201 P2202