my check engine light came on, so i pulled the codes. 03,04 which on here says its a knock sensor. and a code 05,03 which says is a front right heated sensor. i pulled them from here http://vbxmaxima.8m.com/ecudecoder.html
now i called places around me and they're all telling me different things so i'm confused as to what they mean. autozone said i don't have a front heated sensor and that it was a cylinder 4 misfire? and napa told me different as well. can someone explain what it is or how i can fix it. thank you

 

po304 is a cylinder 4 misfire, you might need, an injector or coil, go with the ignition coil first

 

Ok there is the nissan codes that you pull with the flashing lights for instance 0304 which it looks like you did autozone is talking about the P0304 which is a universal code that is read by a obd2 reader. If you want to confirm the codes you looked up go to autozone and have them pull the codes and they should correspond to the same thing. Also in one of the stickies there is a post that cross references the nissan codes with the reader codes, you can look it up to confirm.

 

Maxfever he didn't say it was the p0304 code.

 

the codes i got are from the blinking light in my car 3 long pulses and 4 short pulses, same with 05,03

 

Replace the O2 sensor and the KS code will go away.

 

What jsutter just said is the way I would go.

 

alright, i'll do that. do you think this has anything to do with me needing to change my spark plugs? and is 120$ about right cause that is what autozone quoted me

 

just found this byu typing 02 sensor on ebay, this will work?
http://cgi.ebay.com/ebaymotors/MAXIM...Q5fAccessories

 

Denso direct fit from ROCKAUTO.COM. ~$50 shipped. DO NOT replace KS yet, replace O2 sensor first. KS is probably a ghost code created in conjunction with the O2 code, very common with the 4th gen.

 

so there is a difference between knock sensor and 02 sensor? cause i type 02 sensor on ebay and it shows both?

 

This is a knock sensor:

This is an 02 sensor:

 

alright, thank everyone for your help, i will be looking on rockauto as soon as i get home from work

 

knock sensor pretty much puts your car into limp mode

 

I would say that's not accurate. You lose a little power and fuel economy. Limp home mode is under 3K RPM and stuck in second gear for the AT guys. For the most part, a bad KS is unnoticeable.