P23AC

NOx Sensor Circuit 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 Is On
Increased fuel consumption
Reduced engine power
Dips during acceleration
Smell of fuel from the exhaust system

Causes

Open or short circuit in the NOx sensor circuit
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 integrity of the wiring to the NOx sensor
Inspect the sensor connectors for oxidation or damage.
Check NOx sensor resistance
Replace NOx sensor if necessary
Reset the error and check for its reappearance

Related codes

P23A9 P23AD P23AE