why is my Tesla Model S Plaid/Refresh (2021-present) giving me a check engine light with P0420 code

• •Check engine light illuminated
• •Reduced engine performance
• •Increased fuel consumption
• •Unusual exhaust odors
• •Potential loss of power during acceleration

1. 1Scan the vehicle's OBD-II system with a diagnostic scanner to confirm the P0420 code.
2. 2Inspect the catalytic converter for physical damage or signs of overheating.
3. 3Check for any exhaust leaks in the system before the catalytic converter.
4. 4Verify the condition of the oxygen sensors (pre-cat and post-cat) for proper operation.
5. 5Examine the vehicle's exhaust system for blockages or restrictions.
6. 6Review the vehicle's maintenance history for any recent repairs or 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
• •Multimeter
• •Socket set
• •Torque wrench
• •Jack and jack stands

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