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I am of the understanding that the 124 uses Mazda CAN bus.
 
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CAN bus is now universal for generic emission OBD II codes so any reader will work for this level. Where things get complicated is the manufacturer specific codes and live data. My guess is the 124 uses a FIAT / Alfa Romeo ECU and related proprietary OBD data. This way the dealer service techs would only need one diagnostic scanner for all the cars. Would like to hear from someone who knows if this is right as I'm just guessing :)
 
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