P23B2

NOx Sensor Heater Control Circuit Low Bank 1 Sensor 3

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$89–278 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased fuel consumption
Dips during acceleration
Unstable idling

Causes

NOx sensor heater circuit open
Short circuit in control circuit
Malfunction of the NOx sensor itself
Wiring Harness Problems
Engine control unit malfunction

How to Fix

Check the continuity of the sensor heater circuit
Check sensor heater resistance
Inspect the wiring harness for damage
Check the power and ground of the control circuit
Replace NOx sensor if necessary

Related codes

P23B0 P23B1 P23B3