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Engine position sensor failure

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Hi guys.  Im new at this..

Bought a mack ch7 2000 renual motor 470hp


On low reves it seems to beep 3 times and on the little pilot screen it says engine position sensor failure inactive

Usually happens on low reves cuts out quater of a second but does not degrates its self..


Could it be the sensor?

Thanks in advance 

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first try cleaning the flywheel sensor by the clutch arm!  then Try replacing the cam sensor the front  of the engine at one point there were issues with the front cover of the engine flexing!

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