my Toyota Corolla E210 (2019-2024) shows P0420 code how to resolve it

Solution

1. Preparation

• Gather required tools and parts.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent any electrical issues.

2. Inspect and Replace Oxygen Sensors (if necessary)

1. Locate the upstream and downstream oxygen sensors.
2. Disconnect the electrical connectors from both sensors.
3. Use an O2 sensor socket to remove the sensors from the exhaust manifold and catalytic converter.
4. Install the new oxygen sensors, ensuring they are tightened to the manufacturer’s specifications (typically around 30 lb-ft).
5. Reconnect the electrical connectors.

3. Inspect and Replace Catalytic Converter (if necessary)

1. Remove the exhaust heat shield if applicable, using a socket set.
2. Use a socket or wrench to unbolt the catalytic converter from the exhaust piping.
3. Remove the catalytic converter from the vehicle.
4. Install the new catalytic converter, ensuring proper alignment and secure fastening (torque to manufacturer specifications).
5. Reinstall the exhaust heat shield.

4. Reconnect Battery and Clear Codes

1. Reconnect the battery terminals, ensuring a tight fit.
2. Use the OBD-II scanner to clear the P0420 code from the system.