how to fix P0420 code in Toyota Camry XV50 (2012-2017)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the vehicle to cool if it has been running.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream oxygen sensor:
   • Use an oxygen sensor socket to unscrew the sensor from the exhaust manifold.
   • Disconnect the electrical connector.
2. Install the new upstream oxygen sensor:
   • Apply anti-seize compound on the threads of the new sensor.
   • Screw it into place and connect the wiring harness.
3. Repeat for the downstream oxygen sensor if necessary.

3. Inspect and Replace Catalytic Converter (if needed)

1. Remove the catalytic converter:
   • Support the vehicle on jack stands and remove any heat shields if applicable.
   • Disconnect the exhaust pipes from the catalytic converter using a socket set.
   • Remove mounting bolts or clamps securing the catalytic converter.
2. Install the new catalytic converter:
   • Position the new converter in place and secure it with bolts or clamps.
   • Reconnect the exhaust pipes and ensure all connections are tight.
3. Reinstall any heat shields removed earlier.

4. Final Steps

1. Reconnect the battery:
   • Attach the negative terminal back to the battery.
2. Clear the error codes:
   • Use an OBD-II scanner to clear the P0420 code from the vehicle’s computer.
3. Test drive the vehicle:
   • Drive the vehicle for a minimum of 20 minutes to allow the system to monitor for any new issues.