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

Solution

1. Preparation

• Gather tools and parts necessary for the job.
• Disconnect the battery to ensure safety.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench.
• Remove the O2 sensor located before the catalytic converter.
  • Use the O2 sensor socket to unscrew the sensor.
  • Inspect the sensor for damage and replace it if necessary.
• Install the new O2 sensor and torque it to manufacturer specifications (typically around 30 ft-lbs).
• Repeat the process for the post-cat O2 sensor if it is also faulty.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, jack and jack stands, exhaust pipe cutter (if necessary), gasket scraper.
• Raise the vehicle securely with jack stands.
• Locate the catalytic converter and inspect for external damage.
• If replacement is necessary, disconnect the exhaust pipes from the catalytic converter.
  • Use the socket set to remove the bolts and exhaust clamps.
  • If rusted, an exhaust pipe cutter may be required.
• Remove the old catalytic converter and clean the mounting surfaces.
• Install the new catalytic converter with new gaskets and torque bolts to specifications (usually around 40-50 ft-lbs).

4. Reset the Engine Control Module (ECM)

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code from the ECM.