how to fix Tesla Model S Original (2012-2020) check engine light P0420 code

• •Check engine light illuminated
• •Decreased fuel economy
• •Engine performance issues (e.g., reduced power)
• •Increased exhaust emissions
• •Unusual smells from exhaust (e.g., sulfur)

1. 1Use an OBD-II scanner to confirm the P0420 code and check for any other related trouble codes.
2. 2Inspect the exhaust system for visible damage or leaks that could affect the catalytic converter's operation.
3. 3Measure the oxygen sensor voltages using a multimeter to ensure they are operating within normal parameters.
4. 4Check the condition of the catalytic converter for signs of physical damage, clogging, or excessive carbon buildup.
5. 5Inspect the exhaust gas temperature sensors (if equipped) for proper operation.
6. 6Review the vehicle's maintenance history for any recent repairs that may have impacted the exhaust system.

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
• •Wrench set
• •Torque wrench
• •Multimeter
• •Exhaust system cleaner

• •Oxygen sensors (upstream and downstream)
• •Catalytic converter cleaner (if applicable)