how to fix P0420 code on Ford Explorer Fifth Generation (2011-2019)

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to ensure safety while working on electrical components.
• Raise the vehicle using a jack and secure it with jack stands.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, wrench set, multimeter
• Locate the upstream and downstream oxygen sensors.
• Disconnect the electrical connectors for both sensors.
• Using the O2 sensor socket, remove the upstream sensor first, followed by the downstream sensor.
• Install the new oxygen sensors by reversing the removal process, ensuring they are securely tightened to manufacturer specifications.

3. Inspect and Replace Catalytic Converter (if needed)

• Tools Required: Socket set, exhaust pipe cutter, gaskets
• If inspection indicates the catalytic converter is damaged, proceed to remove it.
• Remove any bolts or clamps securing the catalytic converter to the exhaust system using a socket set.
• Cut the exhaust pipe if necessary, ensuring a clean cut for proper fitment of the new converter.
• Install the new catalytic converter, using new gaskets and ensuring all connections are tight and leak-free.

4. Reset the Check Engine Light

• Reconnect the battery.
• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
• Start the engine and allow it to run for a few minutes.