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post #7 of (permalink) Old 14th January 2007
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OBDII is a pretty poor attempt at standardising the interface for vehicle diagonstics. All they really managed to settle on standardising was the connector.

Manufacturers couldn't even agree on a communications protocol, so there are actually three different ones (Renault use the CAN protocol.) Then on top of that, even once you've got the protocol right, there are only a few basic parameters that are actually standard. Manufacturers each have their own 'extended' codes, meaning that you need an EOBD computer specific to your car's manufacturer to actually access all of the features.

So much for standardisation eh?
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