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

• •Check engine light illuminated
• •Decreased fuel efficiency
• •Reduced engine power during acceleration
• •Unusual exhaust smells (e.g., sulfur-like odor)
• •Poor engine performance or stalling

1. 1Scan the vehicle's OBD-II system using a compatible scanner to confirm the P0420 code and check for any additional codes.
2. 2Inspect the exhaust system visually for any signs of leaks or damage to the catalytic converter.
3. 3Check the oxygen sensors (upstream and downstream) for proper function and inspect their wiring for any damage.
4. 4Test the catalytic converter temperature using an infrared thermometer to compare inlet and outlet temperatures.
5. 5Inspect for any exhaust blockages or restrictions that may affect the catalytic converter's performance.
6. 6Verify the engine's fuel trim data using the OBD-II scanner to check for any fueling issues that could affect the catalytic converter.

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
• •O2 sensor socket
• •Ratchet
• •Torque wrench
• •Infrared thermometer
• •Socket set

• •Upstream oxygen sensor
• •Downstream oxygen sensor
• •Catalytic converter (if defective)
• •Exhaust gaskets and clamps (if needed)