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

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety.

2. Inspect and Replace Oxygen Sensors

1. Remove the upstream and downstream oxygen sensors:
   • Use an oxygen sensor socket or wrench to carefully unscrew the sensors from their mounting locations.
2. Inspect the sensors for carbon buildup or damage.
3. Replace any faulty sensors with new OEM or quality aftermarket sensors.
   • Torque the new sensors to the manufacturer's specifications (usually around 30-40 lb-ft).

3. Inspect and Replace Catalytic Converter

1. If the oxygen sensors are functioning correctly, inspect the catalytic converter:
   • Check for physical damage, rust, or blockages.
2. If replacement is necessary, remove the old catalytic converter:
   • Unbolt any mounting brackets and exhaust bolts using a socket set.
   • If necessary, cut the exhaust pipes using a reciprocating saw.
3. Install the new catalytic converter:
   • Position the new converter and secure it with new gaskets and bolts.
   • Torque the bolts to the manufacturer's specifications.

4. Reconnect Battery and Clear Codes

1. Reconnect the vehicle's battery.
2. Use the OBD-II scanner to clear the P0420 code and any other stored codes.