my Tesla Model 3 Highland (2024-present) is giving me P0420 error code what does it mean

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety while working on the exhaust system.

2. Inspect and Replace Oxygen Sensors

1. Locate the upstream and downstream oxygen sensors.
2. Using a socket wrench, carefully remove the oxygen sensors from their respective locations.
3. Inspect the sensors for damage or contamination; replace if necessary.
4. Install new oxygen sensors and tighten to the manufacturer's torque specifications (typically around 30 ft-lbs).

3. Examine and Replace Catalytic Converter (if needed)

1. Remove any heat shields or brackets securing the catalytic converter.
2. Unbolt the catalytic converter from the exhaust pipes using a socket set.
3. Inspect the catalytic converter for signs of damage such as dents or excessive soot buildup.
4. If replacement is necessary, install the new catalytic converter, ensuring proper alignment and sealing.
5. Torque the bolts to manufacturer's specifications (usually around 25-35 ft-lbs).

4. Reconnect Battery and Clear Codes

1. Reconnect the battery terminals securely.
2. Use an OBD-II scanner to clear the P0420 code from the system.
3. Start the vehicle and allow it to reach operating temperature.