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

• •Check engine light illuminated
• •Decreased fuel efficiency
• •Poor acceleration or loss of power
• •Unusual exhaust smells (e.g., sulfur or rotten egg odor)
• •Increased emissions

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 visually for any obvious signs of damage or leaks.
3. 3Check the oxygen sensors using a multimeter to ensure they are functioning correctly.
4. 4Verify the fuel trim readings to determine if there are any fueling issues that could affect the catalytic converter.
5. 5Conduct a visual inspection of the catalytic converter for signs of physical damage or excessive carbon buildup.
6. 6Perform a smoke test to check for any vacuum leaks in the intake or exhaust systems.

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
• •Socket set
• •Torque wrench
• •Multimeter
• •Smoke machine (for testing leaks)

• •Oxygen sensors (if faulty)
• •Catalytic converter (if necessary)