how to fix a key fob that won't start my Volkswagen Passat B8 (2015-2022)

Solution

1. Preparation

• Gather necessary tools and parts.
• Ensure the car is in a safe location, and the battery is disconnected to avoid electrical shorts.

Tools Required:

• Phillips screwdriver
• Flathead screwdriver
• OBD-II scanner (if needed)

2. Replace Key Fob Battery

• Sub-step 1: Open the key fob using a flathead screwdriver to pry apart the two halves carefully.
• Sub-step 2: Remove the old battery, noting its orientation (+ and - sides).
• Sub-step 3: Insert a new battery (typically CR2032) in the same orientation.
• Sub-step 4: Reassemble the key fob by snapping the halves back together securely.

3. Reprogram Key Fob (if necessary)

• Sub-step 1: Enter the vehicle and close all doors.
• Sub-step 2: Insert the key into the ignition and turn it to the "On" position without starting the engine.
• Sub-step 3: Press and hold the unlock button on the key fob for about 10 seconds while still in the "On" position.
• Sub-step 4: Turn the ignition off and remove the key. Then, test the fob by attempting to start the vehicle.