I had a knock sensor code replaced it had an o2 sensor replaced it.... cleared the lights a couple of times and they just keep turnin back on.... the car drives way better since the ks and o2 change so I know they were done right... the codes just won't turn off....

I also have a multiple cylinder misfire code how do I fix that?

 

find out which cylinders are misfiring and fix the coils. Reset the ECU. Are you positive that the codes coming back are for all of them?

 

Hey i got some spares in my trunk, i'll check it out when i run into you to put in that stock filter.