P04D2

EGR Temperature Sensor C Circuit Intermittent/Erratic

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

Unstable engine idling
Power reduction
Increased fuel consumption
Check Engine light comes on

Causes

Open or short circuit in wiring harness
Poor contact in the sensor connector
EGR temperature sensor malfunction
Corroded terminals or connectors
ECU malfunction (rare)

How to Fix

Visually inspect the wiring harness and connectors for damage
Checking the resistance and voltage in the sensor circuit
Cleaning connector contacts
Replacing the EGR temperature sensor with a confirmed fault
Resetting the error with an OBD-II scanner and checking for reappearance

Related codes

P0401 P0402 P04D1 P04D3