how to fix the ABS light staying on in my Tesla Model S Original (2012-2020)

Solution

1. Preparation

• Gather all necessary tools and parts.
• Ensure the vehicle is parked on a flat surface with the parking brake engaged.
• Disconnect the 12V battery to avoid any electrical issues during the repair.

2. Inspect and Clean ABS Wheel Speed Sensors

• Locate each wheel's ABS speed sensor (usually near the wheel hub).
• Remove any dirt or debris around the sensors.
• If necessary, disconnect the sensor wiring harness and clean the connectors with electrical contact cleaner.
• Reconnect the sensors and ensure they are properly secured.

3. Check Brake Fluid Level

• Locate the brake fluid reservoir.
• Remove the cap and check the fluid level; it should be between the "MIN" and "MAX" marks.
• If low, top up with the manufacturer-recommended brake fluid (usually DOT 3 or DOT 4).

4. Inspect ABS Module and Wiring

• Examine the ABS module for any signs of physical damage or corrosion.
• Check all wiring and connectors leading to the ABS module for fraying or loose connections.
• Repair or replace any damaged wiring or connectors as needed.

5. Reconnect Battery and Clear Codes

• Reconnect the 12V battery.
• Use the OBD-II scanner to clear any stored ABS error codes.
• Start the vehicle and observe if the ABS light remains off.

6. Test Drive and Monitor

• Take the vehicle for a test drive to ensure proper brake function.
• Monitor for the ABS light and any other warning lights on the dashboard.