P040B

EGR Temperature Sensor A Circuit Range/Performance

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–89 (est.)

Symptoms

Check Engine light comes on
Reduced engine power
Increased fuel consumption
Unstable idling

Causes

EGR temperature sensor malfunction
Open or short circuit in wiring harness
Poor contact in connectors
Problems with the engine control unit

How to Fix

Check the integrity of the sensor wiring harness
Check sensor resistance and voltage
Clean or replace EGR temperature sensor
Check connections and connectors
Replace sensor if necessary

Related codes

P0401 P0402 P0403