my Tesla Model Y Current (2020-present) has a check engine light and I see code P0420, what does it...

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a flat surface and the engine is cool.
• Disconnect the battery to prevent electrical shock.

2. Inspect and Replace Oxygen Sensors

• Tools Required: O2 sensor socket, ratchet, torque wrench
• Remove the upstream (pre-catalytic) oxygen sensor by using the O2 sensor socket.
• Inspect the sensor for damage or corrosion; replace if necessary.
• Install the new sensor and torque to manufacturer specifications (typically around 30 lb-ft).
• Repeat the process for the downstream (post-catalytic) oxygen sensor.

3. Inspect and Replace Catalytic Converter

• Tools Required: Wrench set, exhaust pipe cutter (if necessary), gasket scraper
• Unbolt the catalytic converter from the exhaust system, taking care to support it to prevent damage.
• Inspect the catalytic converter for signs of damage or clogging; replace if necessary.
• Clean the mating surfaces of the exhaust system to remove any old gasket material.
• Install the new catalytic converter, ensuring proper alignment and torque to manufacturer specifications.

4. Check and Clear Codes

• Reconnect the battery.
• Use the OBD-II scanner to clear any diagnostic codes from the system.
• Verify that the check engine light remains off during a test drive.