my Tesla Model 3 has a persistent check engine light, what should I do

Solution

1. Preparation

• Gather tools: OBD-II scanner, laptop or device with Tesla software, basic socket set.
• Ensure the vehicle is parked on a level surface with the parking brake engaged.
• Disconnect the negative terminal of the battery to reset the system (if applicable).

2. Retrieve Error Codes

• Connect the OBD-II scanner to the vehicle’s diagnostic port.
• Turn on the ignition without starting the engine to power the scanner.
• Access the diagnostic menu on the scanner and read any error codes.
• Note down the codes and descriptions for further analysis.

3. Address Identified Issues

• Refer to Tesla's service manual or database for the specifics on each error code.
• For sensor-related issues, replace faulty sensors (e.g., oxygen sensor, mass airflow sensor).
• If battery-related codes are present, inspect the battery connections and replace any damaged components.

4. Software Update

• Connect the vehicle to Wi-Fi and check for any available software updates.
• Follow on-screen instructions to install any updates that may resolve the check engine light issue.

5. Reconnect Battery and Test

• Reconnect the negative terminal of the battery.
• Start the vehicle and observe if the check engine light remains illuminated.
• Take the vehicle for a short test drive to monitor performance and check for any alerts.