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

Solution

1. Preparation

• Tools Required: OBD-II scanner, socket set, multimeter, jack and jack stands, safety goggles, gloves.
• Disconnect the battery before starting any work on the vehicle to ensure safety.

2. Inspect and Replace Oxygen Sensors (if necessary)

1. Locate the upstream and downstream oxygen sensors (typically found before and after the catalytic converter).
2. Using a socket wrench, remove the oxygen sensors from the exhaust system.
3. Inspect the sensors for any signs of damage or contamination.
4. If damaged, replace the sensors with OEM or high-quality aftermarket parts.
5. Reinstall the new oxygen sensors, ensuring they are properly torqued to the manufacturer's specifications (usually around 30 lb-ft).

3. Inspect and Replace the Catalytic Converter (if necessary)

1. Raise the vehicle using a jack and secure it with jack stands.
2. Locate the catalytic converter and inspect it for physical damage or excessive carbon deposits.
3. If replacement is needed, remove the mounting bolts securing the catalytic converter to the exhaust system using a socket set.
4. Carefully remove the old catalytic converter from the exhaust system.
5. Install the new catalytic converter, ensuring proper alignment and securing it with the bolts. Torque the bolts to manufacturer specifications.

4. Clear Error Codes

1. Reconnect the battery.
2. Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.

5. Test Drive the Vehicle

1. Start the engine and let it idle for a few minutes.
2. Take the vehicle for a test drive to ensure that the engine operates smoothly and the check engine light does not reappear.