From year and half I have a Audi A6 and haven't any problem. But at now I have a yellow flashing lamp (time to time) not always and if this is hapen, when I start the engine he stopped after a few seconds. The problem I thing isn't the keys, becouse I have two keys and when I try them the yellow lamp is still flashing and at the other day I can start the car with each of them. I measure the antenna coil end the resistanse is about 25 oms and it is stable (not fluctuating). The electonic bord in the white box witch is connected to the antenna is whith good solders, dry and clean. Ecscuse my for my bad english end please help my!!!