how to fix P0420 code in Toyota Camry Eighth Generation (2018-present)

Solution

1. Preparation

• Gather tools and parts needed for repair.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent any electrical shorts.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream oxygen sensor:
   • Use an oxygen sensor socket and ratchet to unscrew the sensor.
   • Disconnect the wiring harness.
2. Install the new upstream oxygen sensor:
   • Apply anti-seize compound on the threads of the new sensor.
   • Screw in the sensor and tighten to manufacturer specifications (typically 30-40 lb-ft).
   • Reconnect the wiring harness.
3. Repeat for the downstream oxygen sensor if necessary.
   • Follow the same steps as above for removal and installation.

3. Inspect and Replace Catalytic Converter (if needed)

1. Remove the exhaust components:
   • Use a socket set to detach the exhaust pipes connected to the catalytic converter.
   • Remove any hangers or brackets holding the converter in place.
2. Install the new catalytic converter:
   • Position the new catalytic converter in place.
   • Reattach the exhaust pipes and any hangers or brackets.
   • Ensure all connections are secure and free of leaks.
3. Re-check all components:
   • Ensure all sensors and connectors are properly attached before reconnecting the battery.