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Just to report the result so that others can make use of this information in the future.
Thanks to hijmmu's help, I got the error codes: P0041 and P0045 which indicate Evaporative Emission Control System issue. I googled on the internet and found this is related to gasoline supply system.
As a previous poster Ard said, the simplest reason could be the user did not securely put the gasoline tank cap on, causing the system to lose negative pressure inside the tank, and triggering the CEL. It could also be there's a real problem in the fuel system.
In this case, the gas tank cap was indeed not fully secured in the previous day before the CEL was turned on. We think it's the very likely cause. "hijmmu" helped to clear the CEL but it went back on right after I drove away. I did nothing else, simply continue to drive as usual. After a few days, the CEL turned off by itself.
Thanks to hijmmu's help, I got the error codes: P0041 and P0045 which indicate Evaporative Emission Control System issue. I googled on the internet and found this is related to gasoline supply system.
As a previous poster Ard said, the simplest reason could be the user did not securely put the gasoline tank cap on, causing the system to lose negative pressure inside the tank, and triggering the CEL. It could also be there's a real problem in the fuel system.
In this case, the gas tank cap was indeed not fully secured in the previous day before the CEL was turned on. We think it's the very likely cause. "hijmmu" helped to clear the CEL but it went back on right after I drove away. I did nothing else, simply continue to drive as usual. After a few days, the CEL turned off by itself.
