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The engine light is on because the car is telling you that something is wrong. It is putting out codes and you need a diagnostic tool to check for the solution.
P0441 Evaporative Emission Control System Incorrect Purge Flow
P0446 Evaporative Emission Control System Vent Control Circuit Malfunction
P0455 Evaporative Emission Control System Leak Detected (Gross Leak) http://www.toyotanation.com/forum/showthread.php?t=128923
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