how to address Tesla Model S Plaid/Refresh (2021-present) check engine light with code P0420?

• •Check engine light illuminated
• •Reduced engine performance
• •Possible increase in fuel consumption
• •Unusual exhaust odor
• •Inconsistent engine operation

1. 1Scan the vehicle's OBD-II system with a diagnostic scanner to confirm the P0420 code and check for any additional trouble codes.
2. 2Inspect the exhaust system visually for any signs of leaks, damage, or loose connections that could affect the catalytic converter's performance.
3. 3Check the vehicle's history for any recent repairs or modifications that could impact the emissions system.
4. 4Test the oxygen sensors before and after the catalytic converter to ensure they are functioning correctly.
5. 5Measure the temperature difference between the inlet and outlet of the catalytic converter using a temperature probe to check for efficiency.

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
• •Multimeter
• •Socket set
• •Torque wrench
• •Exhaust temperature probe

• •New catalytic converter (if necessary)
• •Oxygen sensors (if faulty)