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

• •Check engine light illuminated
• •Decreased fuel efficiency
• •Reduced engine performance
• •Failed emissions test
• •Unusual exhaust odor
• •Increased engine noise

1. 1Scan for error codes using OBD-II scanner to confirm the presence of P0420 and check for additional fault codes.
2. 2Inspect the exhaust system visually for any signs of leaks, damage, or loose connections.
3. 3Check the catalytic converter temperature sensors to ensure they are functioning properly.
4. 4Perform a visual inspection of the catalytic converter for physical damage or excessive carbon buildup.
5. 5Measure the exhaust backpressure to determine if there is a blockage in the exhaust system.
6. 6Verify the fuel trim readings to see if they are within normal ranges, which may indicate fuel delivery issues.

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 and socket set
• •Torque wrench
• •Exhaust sealant (if required)

• •Oxygen sensor(s) (if faulty)
• •Catalytic converter (if damaged)
• •Exhaust gaskets or seals (if leaking)