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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Raise the vehicle securely on jack stands if working underneath.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the upstream oxygen sensor by unscrewing it counterclockwise.
• Install the new upstream oxygen sensor and torque to manufacturer specifications (typically around 30 Nm).
• Repeat the process for the downstream oxygen sensor if it shows signs of failure.

3. Inspect and Replace Catalytic Converter

• Tools Required: Socket set, torque wrench, exhaust sealant, cutting tools if necessary
• Disconnect the exhaust pipes from the catalytic converter by removing the bolts or clamps.
• If necessary, cut the exhaust pipes with a saw if they are corroded or damaged.
• Remove the old catalytic converter and clean the mounting surfaces.
• Install the new catalytic converter, ensuring proper alignment, and secure it with bolts or clamps.
• Use exhaust sealant on joints, if required, to prevent leaks.

4. Reconnect Battery and Clear Codes

• Reconnect the battery terminals securely.
• Use the OBD-II scanner to clear the P0420 code from the vehicle’s computer.