P23BB

NOx Sensor Heater Resistance Bank 1 Sensor 3

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–167 (est.)

Symptoms

Check Engine Light Is On
Increased fuel consumption
Reduced engine power
Unstable engine idling
Increased NOx emissions

Causes

Open or short circuit in the NOx sensor heater circuit
Malfunction of the NOx sensor itself
Connector problems or contact corrosion
Engine control unit malfunction
Wiring harness damage

How to Fix

Check the continuity of the NOx sensor heater circuit
Inspect connectors and contacts for corrosion
Check the resistance of the sensor heating element
Replace NOx sensor if necessary
Check and, if necessary, update the ECU software

Related codes

P23BC P23BD P23BE