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

• •Check engine light illuminated
• •Reduced fuel efficiency
• •Poor engine performance or power loss
• •Increased exhaust emissions
• •Unusual exhaust odors

1. 1Scan the vehicle with 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.
3. 3Measure the voltage output of the upstream and downstream oxygen sensors using a multimeter.
4. 4Check for any software updates or recalls related to the emissions system in the Tesla service records.
5. 5Perform a visual inspection of the catalytic converter for signs of physical damage or overheating.

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
• •High-temperature exhaust sealant

• •Upstream oxygen sensor (if faulty)
• •Downstream oxygen sensor (if faulty)
• •Catalytic converter (if necessary)
• •Exhaust gaskets