why does my Tesla Model S Plaid/Refresh (2021-present) check engine light keep coming on

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked in a safe area with sufficient space to work.
• Disconnect the vehicle from any charging source.

2. Retrieve and Analyze Diagnostic Codes

• Connect an OBD-II scanner to the vehicle's diagnostic port.
• Record any diagnostic trouble codes (DTCs) displayed.
• Research each code to determine the specific issue and required repairs.

3. Inspect Battery and Electrical Connections

• Open the front trunk (frunk) and inspect the battery terminals for corrosion or loose connections.
• Tighten any loose connections to ensure proper contact.
• If corrosion is found, clean the terminals with a mixture of baking soda and water, then dry thoroughly.

4. Update Software

• Connect the vehicle to Wi-Fi and check for any available software updates.
• Follow on-screen instructions to complete the software update process.
• Restart the vehicle to ensure all systems are updated.

5. Clear Codes and Test Drive

• After addressing any identified issues, clear the DTCs using the OBD-II scanner.
• Test drive the vehicle to see if the check engine light reappears.

Tools Required:

• OBD-II scanner
• Basic socket set
• Torque wrench (if applicable)

Parts Required:

• Battery terminal cleaning kit (if corrosion is found)

Estimated Repair Time: 1-2 hours

Safety Warnings:

• Ensure the vehicle is powered off before accessing electrical components.
• Use caution when working with battery terminals to prevent electrical shock.