how to fix P0420 code on Tesla Model S Original (2012-2020)

• •Check engine light illuminated
• •Decreased fuel efficiency
• •Noticeable exhaust odor
• •Reduced engine power during acceleration
• •Increased emissions during smog checks

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 for visible leaks or damage, particularly around the catalytic converter.
3. 3Check the oxygen sensors (upstream and downstream) for proper functioning and connections.
4. 4Verify fuel trim readings with a scan tool to determine if the engine is running too rich or too lean.
5. 5Measure the temperature difference between the inlet and outlet of the catalytic converter using a thermocouple or infrared thermometer.
6. 6Inspect the engine for any vacuum leaks that could affect air-fuel mixture.

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
• •Socket set
• •Torque wrench
• •Thermocouple or infrared thermometer

• •Upstream oxygen sensor (if faulty)
• •Downstream oxygen sensor (if faulty)
• •Catalytic converter (if faulty)