If the alarm remote control on your 98 vw passat doesn't work how can I start the car without the alarm going off if I don't have an extra main key to reprogram the remote?

Your going to have to find the "valet switch". All alarms should have one. Its just a little black button most of the time usually put in somewhere inconvenient so thiefs cant find it. If there isn't one your going to have to find the brain and uplug everything. The brain should be somewhere under the panel below your steering column so your gonna have to take off the panel. Those are really the only two options, other than that go to a professional. Dont mess with any of the wires or your liable to really screw somthin up.