P23B1

NOx Sensor Heater Control Circuit/Open 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
Reduced engine power
Increased fuel consumption
Unstable engine idling
Increased level of harmful emissions

Causes

NOx sensor heater circuit open
Malfunction of the NOx sensor itself
Wiring harness damage
Poor contact in the sensor connector
Engine control unit (ECU) malfunction

How to Fix

Check the continuity of the sensor heater circuit
Inspect connectors and wiring for damage
Check the resistance of the sensor heating element
If necessary, replace the NOx sensor
Reset the error code and check if it returns

Related codes

P23B2 P23A0 P23A1