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

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the negative battery terminal to prevent electrical shorts.
• Allow the engine to cool down completely before beginning repairs.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Sub-steps:
  1. Locate the upstream and downstream oxygen sensors (typically found on the exhaust pipe before and after the catalytic converter).
  2. Disconnect the wiring harness from each oxygen sensor.
  3. Use the O2 sensor socket to remove the sensors from the exhaust system.
  4. Install new oxygen sensors, ensuring they are torqued to the manufacturer’s specifications (usually around 30 ft-lbs).
  5. Reconnect the wiring harness to each sensor.

3. Inspect and Replace the Catalytic Converter

• Tools Required: Socket set, torque wrench, cutting tools (if necessary), exhaust gasket
• Sub-steps:
  1. Remove any heat shields covering the catalytic converter.
  2. Disconnect the exhaust pipes from the catalytic converter using a socket set.
  3. If necessary, cut the exhaust pipe with a reciprocating saw for easier removal.
  4. Remove the catalytic converter from the vehicle.
  5. Install the new catalytic converter and secure it with the exhaust clamps or bolts.
  6. Replace any exhaust gaskets to prevent leaks.
  7. Reinstall heat shields if applicable.