how to fix P0420 code on my Toyota Camry XV70 (2018-2024)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during repairs.
• Raise the vehicle and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream oxygen sensor (before the catalytic converter).
   • Tools: O2 sensor socket or wrench.
   • Safety Warning: Wear gloves and safety glasses.
2. Install the new upstream oxygen sensor and tighten it to the manufacturer's specifications.
3. Remove the downstream oxygen sensor (after the catalytic converter).
   • Tools: O2 sensor socket or wrench.
4. Install the new downstream oxygen sensor and tighten it to the manufacturer's specifications.

3. Inspect and Replace Catalytic Converter

1. Remove the exhaust pipe connected to the catalytic converter.
   • Tools: Socket set, torque wrench.
2. Unbolt the catalytic converter from its mounting points.
3. Check for clogging or damage on the old catalytic converter.
4. Install the new catalytic converter in reverse order of removal.
   • Ensure proper alignment and secure all bolts to the specified torque.

4. Reset the ECU

1. Reconnect the battery.
2. Use the OBD-II scanner to clear the P0420 code and any other stored codes.