P042D

Symptoms

• Check Engine Light Is On
• Reduced engine power
• Increased fuel consumption
• Unstable idling

Causes

• Short circuit in the temperature sensor circuit
• Malfunction of the catalytic converter temperature sensor
• Wiring harness damage
• Problems with the engine ECU
• Corrosion of contacts or connectors

How to Fix

1. Check the integrity of the wiring harness and connectors
2. Measure the resistance of the temperature sensor
3. Check the voltage in the sensor circuit
4. Replace temperature sensor if necessary
5. Clean or replace damaged wires
6. Reset the error and check for reappearance

Related codes

Error P042D by Vehicle Brand