how to fix P0420 code on Tesla Model S Plaid/Refresh (2021-present)

• •Check Engine Light illuminated
• •Reduced engine performance
• •Decreased fuel efficiency
• •Unusual exhaust odor
• •Failed emissions test (if applicable)

1. 1Scan for error codes using an OBD-II scanner to confirm the P0420 code and check for any additional codes.
2. 2Inspect the exhaust system for any visible leaks or damage, particularly around the catalytic converter.
3. 3Check the oxygen sensors’ operation by reviewing their live data while the vehicle is running.
4. 4Verify the integrity of the catalytic converter by performing a temperature test at the inlet and outlet to check for a significant temperature difference.
5. 5Inspect wiring and connectors related to the oxygen sensors for signs of corrosion or disconnection.

After completing the repair, verify that the issue has been resolved:

• ✓Test the affected component to ensure it functions correctly
• ✓Check for any error codes or warning lights
• ✓Monitor the vehicle for a few days to ensure the issue does not recur

To prevent this issue from occurring again:

• •Follow the manufacturer's recommended maintenance schedule
• •Address warning signs early before they develop into major issues
• •Use quality parts and fluids recommended for your vehicle
• •Keep detailed records of all repairs and maintenance

• •OBD-II scanner
• •Oxygen sensor socket
• •Socket set
• •Torque wrench
• •Anti-seize compound

• •Oxygen sensors (upstream and downstream)
• •Catalytic converter (if found faulty)