U029E

Lost Communication With NOx Sensor B

Severity

⚠️ Medium

Can you drive?

Yes, but get it checked soon

Approx. repair cost

$56–278 (est.)

Symptoms

Check Engine Light Is On
Reduced engine power
Increased fuel consumption
Activation of emergency operation
Problems with passing inspection due to emissions

Causes

Broken or damaged wires to NOx B sensor
Malfunction of the NOx B sensor itself
Problems with sensor connectors
Engine ECU malfunction
Short circuit in the sensor circuit

How to Fix

Check the integrity of the wiring harness to the NOx B sensor
Inspect the sensor connectors for corrosion or damage.
Check the power supply and ground of the sensor
Test or replace NOx B sensor
Check ECU software for updates

Related codes

U029D U029F U0100