how to fix P0420 code in Ford Mustang S650 (2024-Present)?

Solution

1. Preparation

• Gather tools and parts required for the repair.
• Disconnect the battery to prevent electrical shocks.
• Allow the engine to cool before working on the exhaust components.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the upstream and downstream oxygen sensors using the O2 sensor socket.
• Inspect the sensors for damage or contamination.
• If damaged, replace with OEM or quality aftermarket sensors.
• Torque the new sensors to the manufacturer's specifications (typically around 30 lb-ft).
• Reconnect the battery.

3. Inspect and Replace Catalytic Converter (if needed)

• Tools Required: Socket set, torque wrench, exhaust pipe cutter (if necessary)
• Remove any heat shields or brackets securing the catalytic converter.
• Unbolt the catalytic converter from the exhaust system using the socket set.
• Inspect for clogs or damage. If the catalytic converter is faulty, replace it with a new OEM part.
• Reinstall the new catalytic converter, ensuring all bolts are torqued to the manufacturer's specifications (usually around 40 lb-ft).
• Reattach heat shields and brackets.

4. Clear Codes and Test Drive

• Use the OBD-II scanner to clear the P0420 code from the vehicle's computer.
• Start the engine and let it idle for a few minutes to ensure no leaks are present.
• Take the vehicle for a test drive to verify the repair and ensure the check engine light does not return.