PLkiller

Hi..I see a lot of knowledge floating around here so I decided to ask a newbie question (Search feature doesn't work.) I got a 0304 code for bad O2 sensor. When I called napa and local auto part stores I was asked if it was before or after the cat. Also I was told there are multiple sensors. Which one(s) do I replace? Help please!!! Do I need to buy 3 sensors or 1 or what?
Thanx in advance...

BlackCat

iTrader: (6)

Knock sensor, not O2 sensor....
Check out the link:
http://www.motorvate.ca/mvp.php/507

jbreit

Blackcat is right...0304 is a knock sensor. Don't buy that part from NAPA...they charge twice what any other place does last time I checked. Look on Ebay or thepartsbin.com.

If and when you get an O2 sensor code the description wil tell you which one it is out of the three. One for each cylinder bank and one after the CAT. And when its time for one of them, try oxygensensors.com for a good price.

Have fun,
JB

BlackCat

iTrader: (6)

And when you get around to replacing the knock sensor....

http://forums.maxima.org/showthread.php?t=333236