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

Solution

1. Preparation

• Disconnect the battery to prevent any electrical shorts.
• Gather necessary tools and parts for the repair.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the upstream oxygen sensor (bank 1) by using the O2 sensor socket; torque it to the manufacturer’s specification upon installation.
• Inspect the wiring and connector of the oxygen sensor for damage; replace if necessary.
• Repeat for the downstream oxygen sensor (bank 1).

3. Examine and Replace Catalytic Converter

• Tools Required: Socket set, jack stands, exhaust pipe cutter (if needed).
• Lift the vehicle securely on jack stands and locate the catalytic converter.
• Remove any heat shields or covers that obstruct access to the catalytic converter.
• Disconnect the exhaust pipes from both ends of the catalytic converter, using the socket set.
• If necessary, cut the exhaust pipe to remove the catalytic converter.
• Install the new catalytic converter: align it with the exhaust system and secure it with bolts, torquing to the manufacturer’s specifications.
• Replace any heat shields or covers removed earlier.

4. Reconnect Battery and Clear Codes

• Reconnect the battery.
• Use an OBD-II scanner to clear the P0420 code and any other codes present.