P040A

EGR Temperature Sensor A Circuit

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$33–133 (est.)

Symptoms

Check Engine Light Is On
Unstable idling
Reduced engine power
Increased fuel consumption
Dips during acceleration

Causes

Faulty EGR temperature sensor
Open or short circuit in wiring harness
Poor contact in connectors
Contact corrosion
Engine control unit malfunction

How to Fix

Diagnosing the Sensor Circuit Using a Multimeter
Checking the integrity and resistance of the wiring harness
Inspect connectors for corrosion and damage
Replacing the EGR temperature sensor if necessary
Cleaning contacts and restoring connections
Reset error code and test drive

Related codes

P0401 P0402 P0403 P0404 P0405