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Incompatible HUD

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I bought an after market HUD for my Mondeo Mk4.5 sport. A bit gimmicky I know! It plugs into the OBD2 port and gives MPH etc. It works about 50% of the time, but the other 50% it displays "ERR". I contacted the manufacturer and the supplier and they both said the same thing. "Your car is incompatible and it is probably generating invalid rpm values.". This sounds like a bit of hogwash to me. I can't believe that Ford would make that sort of mistake. Even if they did the HUD should just ignore the data packet and carry on. Instead it displays an error message and then reboots. I tried the unit in my wife's Fiesta and it works fine.


Has anyone else had this issue? Has anyone been able to get a HUD to work with this model of vehicle?

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