It has been about 2 months and this problem comes back about 3 times already. The check engine light always comes up first thing in the morning (never during the day) when I turn on the engine. After reset the light with the OBDII scan tool borrowed from Autozone, it will stay off for 2 to 3 weeks. I don't mind keep resetting the light. But the only thing concerns me right now is that this car is due for a smog check. Do you think I should have the problem checked out before the smog check? Thanks for your thought.

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Harry (94 C280)