That seems a little low for mileage and the Catalyst code would more than likely cause crappier fuel economy.

 

Do you hear the airpump turn on when you crank the car and it is cold?

 

more info why it cause crappy fuel effecients plz

 

no, i dont =/ ... i was looking for that sound in the morning when the car was totally cold but i couldnt hear nothing, all i heard was the car reving up, but nothing about the air pump or something like that ..

 

replace the air pump