P0425

Catalyst Temperature Sensor Circuit Bank 1 Sensor 1

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$56–167 (est.)

Symptoms

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

Causes

Open or short circuit in the sensor wiring harness
Malfunction of the catalyst temperature sensor
Poor contact in the sensor connector
Problems with the ECU

How to Fix

Check the integrity of the sensor wiring harness
Check the resistance and signal of the temperature sensor
Clean or replace sensor connector
If necessary, replace the catalyst temperature sensor
Check and reflash the ECU if a software error is suspected

Related codes

P0420 P0430 P0135