my Volkswagen Passat B8 (2015-2022) key fob is not working, how can I fix it

Solution

1. Battery Replacement

1. Open the Key Fob: Use a small flathead screwdriver to gently pry apart the key fob casing.
2. Remove Old Battery: Take out the old battery (usually a CR2032) and dispose of it properly.
3. Install New Battery: Insert a new battery, ensuring the positive side (+) faces the correct direction.
4. Reassemble the Fob: Snap the key fob casing back together, ensuring it's securely closed.

2. Reprogram the Key Fob

1. Enter the Vehicle: Sit in the driver’s seat with all doors closed.
2. Turn on Ignition: Insert the working key into the ignition, turn to the "On" position without starting the engine.
3. Press the Lock Button: On the key fob, press and hold the "Lock" button for about 5 seconds; this may trigger programming mode.
4. Turn Off Ignition: Turn the ignition off and remove the key.
5. Test the Key Fob: Attempt to lock/unlock the doors with the key fob.

3. Check for Physical Damage

1. Inspect the Key Fob: Look for cracks, broken buttons, or signs of damage.
2. Clean the Contacts: If the contacts are dirty, use isopropyl alcohol and a cotton swab to clean them.
3. Repair or Replace: If damage is severe, consider replacing the key fob.