2009-2010 Ski-Doo REV-XP/XR 2 Stroke and REV-XR 1200 4-TEC Service Manual, Page 225Get this manual
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Section 03 ENGINE MANAGEMENT SYSTEM Subsection 05 (MONITORING SYSTEM AND FAULT CODES )
CHECK ENGINE Engine faultKNOCK Engine detonationEnsure recommended fuel is usedCheck fuel quality, replace