P0426 Fault Code

Catalyst Temperature Sensor Range/Performance (Bank 1 Sensor 1)

• What does that mean?
• Symptoms
• Causes
• Solutions

The P0426 fault code indicates an issue with the performance or range of the catalyst temperature sensor located in Bank 1, sensor 1. This sensor plays a key role in monitoring the temperature of the catalytic converter, ensuring optimal performance and emissions control.

• This code may flag due to a fault in the sensor itself, wiring problems, or issues with the catalytic converter.
• It is essential for the engine control unit (ECU) to receive accurate temperature readings to adjust fuel mixture and ignition timing.

What are the symptoms of the P0426 code?

Symptoms associated with the P0426 code may include:

• Check Engine Light illuminated
• Poor engine performance or reduced power
• Increased fuel consumption
• Engine may run rich or lean due to improper fuel management
• Overheating of the catalytic converter, leading to potential damage

What causes the P0426 code?

Common causes of the P0426 code include:

• Faulty catalyst temperature sensor
• Damaged or corroded wiring or connectors
• A malfunctioning catalytic converter
• Issues with the engine control module (ECM)
• Exhaust leaks that may lead to incorrect temperature readings

How to fix P0426?

To resolve the P0426 fault code, one or more of the following actions may be taken:

• Inspect and repair or replace the catalytic temperature sensor if faulty.
• Check wiring and connectors for signs of wear, corrosion, or damage and repair as necessary.
• Examine the catalytic converter for any signs of malfunction or blockage and replace if needed.
• Clear the trouble codes and conduct a test drive to see if the code returns.