how to fix Honda CR-V Sixth Generation (2023-present) P0420 code

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the negative battery cable to prevent electrical shorts.
• Allow the exhaust system to cool down before starting the repair.

2. Inspect and Replace Oxygen Sensors

• Step 1: Remove the upstream oxygen sensor (located before the catalytic converter).
  • Tools Required: O2 sensor socket, ratchet.
• Step 2: Install the new upstream oxygen sensor and tighten it to manufacturer specifications (typically around 30 ft-lbs).
• Step 3: Repeat the process for the downstream oxygen sensor (located after the catalytic converter).

3. Inspect and Replace Catalytic Converter

• Step 1: Remove any heat shields or mounting brackets securing the catalytic converter.
• Step 2: Unbolt the catalytic converter from the exhaust piping using a socket set.
• Step 3: Install the new catalytic converter, ensuring proper alignment with the exhaust system.
  • Tools Required: Torque wrench (typically torque to 30-45 ft-lbs depending on the model).
• Step 4: Reinstall any heat shields or brackets removed during the process.

4. Clear Codes and Test

• Step 1: Reconnect the negative battery cable.
• Step 2: Use the OBD-II scanner to clear any existing error codes.
• Step 3: Start the vehicle and allow it to reach operating temperature.