my cel is on got the ks code and front 02 sensor code. im getting horrible gas mileageand my ques. is which should i replace first? someone told me to replace the 02 then clear codes and it should be good. i was thinking i should replace the ks and clean the 02 sensor and see what happens because i really dont want to do both if i dont have to being the holiday season and all. im also going to by a manual this weekend and i was wondering what the best one is? i greatly appreciate any advice given.thanks

 

Replace the O2 sensor first and get your gas mileage back. Clear the codes and you might not have to replace the knock sensor