This top-tier aftermarket starter solenoid fits **Polaris Rzr S 800 Efi** models from 2009 to 2014 without compatibility issues. It matches OEM reference numbers **4012001**, **4010947**, **4011335** completely. This vital electrical hardware passes 12V power from the battery over to the starter motor. It keeps the engine cranking smoothly and holds stable ignition performance for cross-country travel and daily outdoor rides. It features a heavy-duty fully sealed construction, which suits bumpy paths, muddy wet ground and changeable weather conditions perfectly. It can fix most regular starting defects, such as sporadic cranking, continuous clicking and delayed startup response.