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Polaris 850 ,2010 speedometer only works part time and I get codes 84-2 and 84-19. Anyone got an idea what it is
 

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84-2 is a vehicle speed signal plausibility fault
84-19 vehicle speed (this is applicable when the EPAS module gets the vehicle speed from the ECM)

Can't say definitively what to do to fix it - one choice is to clean and grease connections - another choice is to install a new speed sensor and hope for the best - best choice is to take it to a dealer, have them run the diagnostics and repair the fault.
 
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