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

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the battery to ensure safety during the repair.
• Allow the vehicle to cool down if the engine has been running.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, torque wrench.
• Remove the upstream oxygen sensor first:
  • Locate the sensor on the exhaust manifold.
  • Use the O2 sensor socket to carefully unscrew it from the exhaust pipe.
• Install the new upstream O2 sensor:
  • Apply anti-seize compound to the threads of the new sensor.
  • Torque to manufacturer specifications (usually around 30 lb-ft).
• Repeat the process for the downstream oxygen sensor.

3. Inspect and Replace Catalytic Converter (if necessary)

• Tools Required: Socket set, jack and jack stands, exhaust gasket.
• Raise the vehicle using a jack and secure it with jack stands.
• Remove any heat shields or brackets obstructing access to the catalytic converter.
• Unbolt the catalytic converter from the exhaust system:
  • Use the socket set to remove the bolts at both ends of the converter.
• Inspect the old catalytic converter for damage or clogging.
• Install the new catalytic converter:
  • Position the new converter and align it with the exhaust pipes.
  • Use new gaskets where applicable and bolt it in place, torquing to manufacturer specifications.
• Reinstall any heat shields or brackets removed earlier.

4. Reconnect Battery and Clear Codes

• Reconnect the vehicle battery.
• Use the OBD-II scanner to clear the P0420 code from the engine control module (ECM).