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Message: <blockquote data-quote="jarance" data-source="post: 458408" data-attributes="member: 21">If you look at the wiring connection below, you can see that the rear sensor is link in series with the front sensor by a wire. (terminal 2 to 2)<img src="http://i122.photobucket.com/albums/o271/pbjy/E46%20Parts/RotationofCapture_2.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />The rear sensor terminal 1 is connected to ground and the front sensor terminal 1 is connected to the instrument cluster.So that means at point from rear sensor to the front sensor that is a break, the alarm will comes on. In my opinion, I would concentrate on the connectors first for dirt and corrosion at the front and rear. The connectors are working in a wet and dusty environment. Since you mentioned that you can clear the alarm temporary by disconnecting and reconnect back the sensor, I think you have a dry or bad contacts at the connectors. you can also remove the connector at the front and measure the resistance to the chassis. It should not be more than a few ohms if the contact is good. Also check the grounding at the rear for loose connection.As for the non communication with your car, can the diagnostic communicate with other BMW or just cannot communicate only with your BMW. what brand or type is the diagnostic tools.</blockquote>