Recently my SES light came on and codes p0171 and p0174 were showing. I though it might be the because of the front 02's so i changed them. the SES light turned off and i still feel like something is wrong. it seems theres less power than normal and doesnt feel the same at WOT and is getting very bad gas mileage. any ideas? thanks

 

yeah those codes are for front o2's, and are you still getting terrible MPG with new o2's?
Try cleaning your MAF sensors.

 

ya still getting bad mpgs after changing the 02s. could it have something to do with the fuel filter at all not getting the right amount to the injectors because i have no idea when it was changed last