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

• •Check engine light illuminated
• •Decreased fuel efficiency
• •Poor acceleration performance
• •Engine misfires or rough running
• •Unusual exhaust smells (e.g., sulfur-like odors)

1. 1Scan for error codes using an OBD-II scanner to confirm the P0420 code.
2. 2Inspect the exhaust system for any visible leaks or damage.
3. 3Check the condition of the catalytic converter for any signs of physical damage or blockage.
4. 4Verify the functionality of the oxygen sensors before and after the catalytic converter.
5. 5Inspect the engine's air-fuel mixture to ensure it is optimal.
6. 6Review any recent modifications to the exhaust system that could affect emissions.

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 hanger removal tool

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