P23B7

NOx Sensor Heater Control Circuit Range/Performance 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
Increased emissions of harmful substances
Incorrect operation of the exhaust gas purification system

Causes

NOx sensor heater malfunction
Open or short circuit in control circuit
Poor contact in wiring connectors
Control module malfunction
Circuit power problems

How to Fix

Check the integrity of the heater control circuit
Inspect connectors and contacts for corrosion or damage
Check NOx sensor heater resistance
If necessary, replace the NOx sensor
Check the operation of the control module

Related codes

P23B6 P23B8 P229F