how to fix P0420 code in my Toyota RAV4 XA40 (2013-2018)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.

2. Inspect Oxygen Sensors

• Tools Required: OBD-II scanner, multimeter.
• Check the upstream and downstream oxygen sensors by measuring their voltage output.
  • Upstream should fluctuate between 0.1V to 0.9V.
  • Downstream should show a more stable reading (close to 0.5V).
• Replace any faulty oxygen sensors as needed.

3. Examine Exhaust System

• Inspect the exhaust for leaks or damage.
• Tools Required: Socket set, pry bar.
• Tighten or replace any loose or damaged exhaust components.

4. Replace Catalytic Converter (if necessary)

• Tools Required: Wrench set, exhaust pipe cutter, gasket scraper.
• Remove the old catalytic converter:
  • Safely lift the vehicle using jack stands.
  • Disconnect the exhaust pipes from the catalytic converter using a wrench or pipe cutter.
  • Remove any bolts or clamps securing the catalytic converter.
• Install the new catalytic converter:
  • Place the new catalytic converter in position and secure it with bolts or clamps.
  • Reconnect the exhaust pipes and ensure all connections are tight.

5. Reset Engine Light

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's memory.