OBD II Mileage

Hi everyone,

I was wondering if anyone knows how to poll a vehicles ECU for a mileage reading.  I believe you can send a hex code to a vehicles ECU and have it ack back with a mileage reading.  Does anyone know how to do this?  Thanks.
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The car would have to have the ECU installed for that to work


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All cars after 1996 are required to have OBD II installed.  A scan tool will be able to interface with the OBD computer or possibly a cpu with an usb or serial -> obd connector.  Some manufacturers have specific codes only applicable to their car, but most likely I would think mileage would be a standard code.  
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