Wow Check engine light

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My car is a 2003 c230 sedan 75k miles.
my question: i used to get 23mpg to 27mpg. now i get 16mpg at idle and 19 city and 26 freeway. what could have caused this? spark plugs? MAF? or fuel filter? those are the only possibilities i could think of..

My car is a 2003 c230 sedan 75k miles.
my question: i used to get 23mpg to 27mpg. now i get 16mpg at idle and 19 city and 26 freeway. what could have caused this? spark plugs? MAF? or fuel filter? those are the only possibilities i could think of..
How long has it been since you did this service and how many tanks have you noticed be this much worse?






