P23AF

NOx Sensor Circuit High 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 comes on
Increased fuel consumption
Reduced engine power
Unstable engine idling
Increased NOx emissions

Causes

NOx sensor malfunction
Open or short circuit in the sensor circuit
Poor contact in the sensor connector
Wiring Harness Problems
Engine control unit malfunction

How to Fix

Check the integrity of the wiring to the NOx sensor
Inspect the sensor connector for corrosion or damage.
Check the resistance and voltage in the sensor circuit
Replace NOx sensor if necessary
Reset the fault code and check for its reoccurrence

Related codes

P23B0 P23AE P23B1