P23BA

NOx Sensor Heater Sense Circuit Intermittent 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 Is On
Reduced engine power
Increased fuel consumption
Unstable idling
Dips during acceleration

Causes

Open or short circuit in the NOx sensor heater circuit
Poor contact in the sensor connector
Malfunction of the NOx sensor itself (bank 1, sensor 3)
Damage to the wiring harness near the exhaust system
Problems with the engine control unit

How to Fix

Check the continuity and voltage in the heater circuit
Inspect the connectors and contacts of the sensor for corrosion
Measure the resistance of the sensor heating element
If necessary, replace the NOx sensor
Check for ECU firmware updates

Related codes

P23BB P23BC P229F