How do I program my Audi A4's keyless entry system?

I recently purchased an Audi A4 and I'm having trouble figuring out how to program the keyless entry system. I want to be able to unlock and lock my car without having to use the key fob. Can anyone provide step-by-step instructions?

To program your Audi A4's keyless entry system, first make sure your car is in PARK. Then, press and hold the unlock button on the key fob for 5 seconds. Next, turn the key to the ON position and release the unlock button. Finally, press and release the unlock button again to confirm. For more detailed instructions, refer to your car's manual.

I've had success with programming the keyless entry system by using the spare key fob. First, press and hold the unlock button on the fob for 5 seconds. Then, turn the key in the driver's side door to the unlock position, and quickly press and release the unlock button on the fob. This should synchronize the fob to your car.

If you're still having trouble, try resetting the keyless entry system. Remove the key from the ignition and lock the door manually. Then, press and hold the unlock button on the key fob while turning the key in the ignition to the ON position. Release the unlock button and turn off the ignition. Finally, test the keyless function by pressing the lock button on the fob.