1. A remote diagnostic system for vehicles ( 21 ), the system comprising: a base station ( 17 ) having a processor ( 23 ) associated with a transceiver ( 25 ); a remote unit ( 19 ) installed in a vehicle ( 21 ), said remote unit ( 17 ) having a controller ( 63 ) associated with a transceiver ( 25 ′), said controller ( 63 ) operable to gather diagnostic data; and said remote unit ( 19 ) controller ( 63 ) configured to transmit a vehicle ( 21 ) identification signal in conjunction with diagnostic data to said base station ( 17 ) transceiver ( 25 ) such that said base station ( 17 ) processor ( 23 ) monitors said diagnostic data for said vehicle ( 21 ).