P0426

Catalyst Temperature Sensor Circuit Range/Performance Bank 1 Sensor 1

Severity

⚠️ Medium

Can you drive?

Limited driving only, diagnose soon

Approx. repair cost

$22–56 (est.)

Symptoms

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

Causes

Faulty catalyst temperature sensor
Open or short circuit in wiring harness
Poor contact in the sensor connector
Catalytic converter fault com.conob
Problems in the ECU

How to Fix

Checking the condition of the catalyst temperature sensor
Checking the integrity of the wiring harness
Checking connector connections and contacts
ECU flashing
Replacing the catalyst temperature sensor, if required
Diagnostics of the catalytic converter

Related codes

P0420 P0421 P0422 P0430