P0408

EGR Sensor B Circuit High

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Unstable engine idling
Increased fuel consumption
Reduced engine power
Check Engine Light Illuminates

Causes

EGR sensor malfunction
Open or shorted wiring harness
Damage to sensor connectors
Malfunction of the engine control unit (ECU)

How to Fix

Check the integrity of the EGR sensor wiring harness and connectors
Test the EGR sensor for correct operation
Replace EGR sensor if necessary
Check and, if necessary, reflash the ECU

Related codes

P0401 P0402 P0403