how to fix Tesla Model Y Current (2020-present) P0420 error code

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle's battery for safety.
• Allow the exhaust system to cool down before starting any work.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench, penetrating oil
• Inspect the upstream and downstream oxygen sensors for damage or corrosion.
• If damaged, remove the old sensors using the O2 sensor socket and penetrating oil if necessary.
• Install new oxygen sensors and torque them to the manufacturer's specifications (typically around 30 lb-ft).
• Reconnect any electrical connectors.

3. Examine and Replace the Catalytic Converter

• Tools Required: Socket set, jack stands, exhaust gasket
• Raise the vehicle using jack stands for accessibility.
• Remove any heat shields or brackets obstructing access to the catalytic converter.
• Unbolt the catalytic converter from the exhaust system, starting with the bolts at the manifold and then at the tailpipe connection.
• Inspect the catalytic converter for internal damage or clogging.
• Install the new catalytic converter with a new exhaust gasket, ensuring all bolts are tightened to the manufacturer's torque specifications.

4. Reassemble and Reconnect Battery

• Reinstall any heat shields or brackets that were removed.
• Reconnect the vehicle's battery.
• Ensure that all tools and equipment are removed from the vehicle.