P23B9

NOx Sensor Heater Sense Circuit High Bank 1 Sensor 3

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$167–444 (est.)

Symptoms

Check Engine Light Is On
Increased fuel consumption
Reduced engine power
Increased NOx emissions
Unstable engine operation at idle

Causes

NOx sensor heater circuit open
Poor contact in the sensor connector
Malfunction of the NOx sensor itself
Wiring harness damage
Problems with the engine control unit

How to Fix

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

Related codes

P23BA P23BB P23BC