U02A1

Lost Communication With NOx Sensor C

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Unstable engine idling
Possible transition to emergency mode

Causes

Open or short circuit in the NOx sensor circuit
Malfunction of the NOx sensor itself
Connector problems or contact corrosion
ECU malfunction
Wiring harness damage

How to Fix

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

Related codes

U02A2 U02A0 P2200 P2201