P23BE

NOx Sensor Performance - Signal Biased/Stuck Low Bank 1 Sensor 3

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$133–278 (est.)

Symptoms

Check Engine light comes on
Increased fuel consumption
Reduced engine power
Incorrect operation of the SCR system
Unstable engine idling

Causes

NOx sensor malfunction
Open or short circuit in the sensor circuit
Oxidation of sensor connector contacts
NOx sensor contamination
Problems with the engine control unit

How to Fix

Check NOx sensor wiring and connectors
Clean sensor connector contacts
Check the resistance and voltage at the sensor
Replace NOx sensor if necessary
Check the operation of the SCR system

Related codes

P229F P2200 P2201