The Check Engine Light may illuminate due to an evaporative emission (EVAP) system fault. Our technicians tell us these EVAP system faults can be difficult to diagnose but it is not uncommon to find a failed charcoal canister or a loose or worn gas cap.Google+
Car Problem Reports
Toyota Land Cruiser Check Engine Light Due to EVAP System
Toyota Land Cruiser Problem
Visitor, 2005 Toyota Land Cruiser, 60,000 mi
Same issue as listed. I have not been able to repair it yet.