how to fix P0420 code in Ford Explorer Sixth Generation (2020-present)

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to prevent electrical shorts.
• Raise the vehicle securely on jack stands if necessary.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet and extensions, torque wrench.
• Remove the upstream (pre-catalytic) oxygen sensor using an O2 sensor socket.
• Inspect the sensor for carbon build-up or damage.
• If faulty, install a new oxygen sensor, ensuring it is torqued to the manufacturer's specifications (usually around 30 Nm).
• Repeat the process for the downstream (post-catalytic) oxygen sensor.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, cutting tools (if needed), exhaust clamps or gaskets.
• Remove the exhaust pipes leading to the catalytic converter.
• Inspect the catalytic converter for signs of physical damage or clogging.
• If needed, unbolt the catalytic converter from the exhaust system; in some cases, cutting may be required.
• Install a new catalytic converter, ensuring all gaskets and clamps are properly secured and torqued to the manufacturer's specifications.

4. Reset the Engine Control Module (ECM)

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