from your first post, you did not change the plugs. you should start with 2 things. compression test and replace the plugs.
stop replacing other parts till the basics are covered.
the o2 code came from the engine miss, the o2 was doing its job and asked for help.

Roy

Answered by ASEMaster6371 (expert)
24,854 answers provided

i already changed out the plugs along with the coil packs along with the o2 sensor

Response from rob77518
3 questions asked

compression?? you stated in your other post you checked them and they were ok. I assumed you did not change them, sorry.

compression is still pending.

Roy

Answered by ASEMaster6371 (expert)
24,854 answers provided

and what exactly does compression mean

Response from rob77518
3 questions asked

A compression test is do to determine if there is sufficient compression when the piston reaches TDC, this is done with a gauge that screws into the spark plug hole, the compressions are read in PSI. ideally you do not want more than 10% variation between cylinders, if a compression is low, this will cause a miss fire, rough idle, poor fuel economy and low power, the worse the compression the worse the symptom will be, compression test is a fairly easy task on most cars, this is a major diagnostic tool for tune related problems.

Answered by mhpautos (expert)
26,913 answers provided