my Tesla Model 3 Original (2017-2023) check engine light is on what to do

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the vehicle is parked on a level surface and the parking brake is engaged.

2. Retrieve and Analyze Error Codes

• Connect the OBD-II scanner to the vehicle's diagnostic port.
• Record all error codes displayed on the scanner.
• Refer to Tesla's service documentation for specific code meanings.

3. Address Identified Issues

• For common codes such as P0420 (Catalytic Converter Efficiency), inspect the catalytic converter and exhaust system.
• Replace any faulty sensors (e.g., O2 sensors) as indicated by the error codes.
• If battery issues are detected, check the battery management system and wiring for faults.

4. Software Update

• Check for available software updates via the Tesla app.
• If updates are available, follow the instructions on the touchscreen to complete the update process.

5. Clear Error Codes

• After addressing the issues, use the OBD-II scanner to clear the error codes.
• Disconnect the scanner and turn off the vehicle.

Tools Required:

• OBD-II scanner
• Basic hand tools (screwdrivers, socket set)

Parts Required:

• Replacement sensors (if applicable)
• Gaskets or seals (if leaks are found)

Estimated Repair Time: 1-3 hours

Safety Warnings:

• Ensure the vehicle is in "Park" mode and the parking brake is engaged before performing any diagnostics or repairs.