how many 02 sensors?

how many 02's are on a 96 mark isnt there a total of 4? also, can dirty 02's be a good place to start for a check engine lt, the car runs fine, but idles a little rough, 95k miles, and another thing, would running a can of seafoam or two through the motor clean up the 02's and maybe shut the engine light off? im trying to find out for a friend before he blows the money for new 02's. thanks for any info.

Before anything, pull the codes. Autozone does it for free.

When you return, let us know the codes and we can help out a lot better.

Yep, 96 = OBD2 = 4 O2 sensors.

If there is a problem with the O2 sensors, there should be a DTC for it.

The seafoam will clean the induction system and may very well smooth out the idle, maybe more so if also used in the gas as an injector treatment. Also may be a good idea to clean the MAF. New plugs may also help at 95K on the clock.

4 02s... save some money and eliminate the last 2 via chip... all they do is gauge cat performance anyways...

For the rough idle... I would do sea-foam.
I would also change the wires and plugs.

What exactly is sea foam?. Where do you get it and how does it work?. Thanks.

well my buddy Ed had the code pulled and it came up with a P1537.
its saying the imrc on bank one is stuck open. faulty fuel cut off valve or something along those lines. now my question is, i have heard them sticking in open before, but is there a way to unstick it without pulling the intake off, will a few cans of seafoam clean it enough to close, and then if it does close, the next problem is the actuator valve on that imrc is most likely not working anymore, so can just that valve be bought? i already told him to try some seafoam for now and see if anything happenes until i can get it in my shop and check it over. he just bought the car yesterday and by the looks of the car, its only been driven around town and probably filled with carbon build up. i dont think anyone ever hammered on it and blew it out, the car looks brand new.

Sea-foam is your cheapest bet... I have heard a few stories of it helping out and "un-sticking". If that doesn't work you need to pull the intake and clean it up.

Jamie, you should know BETTER than to assume that a Check Engine light automatically means the O2 sensor is bad. There are a MILLION+ scenarios that can cause a CE light......

If the car hasn't been driven hard, this is usually the problem that causes them to stick. Minimal over 3k rpm runs(grandpa driver) will cause a buildup on the IMRC and not allow it to properly close once its open.

You can "manually" move the IMRC by accessing the lever in the back by removing the linkage/controller and open/close it by hand. This will free it up and you want it to be able to open and close with the SeaFoam treatment.

Destroyer.......

SeaFoam is a chemical treatment you can purchase at the local parts store. You take a small vacuum line and introduce the chemical into the intake system through one of your vacuum ports. I use the extra nipple ontop of my PCV valve and you basically attach the vacuum line to the PCV, and run the other end into the SeaFoam can. You than start your car, and rev it up to keep it running(chemical bogs the engine down) until the can is empty. Its good to rev it to 4k+ because after 3k the IMRC's open and the SeaFoam will coat the entire intake. After the can is completely empty, you turn the car off and let it sit for a minimum of 15 minutes. This will deteriorate the carbon build up inside your intake, on your IMRC's, on your valves, and on top of the pistons. Next step is to start the car and continually rev it up doing WOT blasts up to 4500 rpms and back down. Your car will continuously smoke VERY BADLY but this is normal, continue to rev until you only get little amounts of smoke. It may also smoke for a few days as the SeaFoam is burning out from the cats.

It is a good idea to replace the spark plugs after you perform a SeaFoam treatment....

jesse i wasnt assuming anything, i asked because reguardless of what is wront he wants to change them, along with wires, fuel filter, plugs, the basics, so he wanted to get 02 sensors too and i wasnt sure how many were there. i just didnt want him to go nuts on tune up stuff yet before even making sure its worth putting money into, but after seeing it, it deffnitely is!

Haha...oh ok, that makes sense. I always recommend 02 sensors with a 60k+ mileage tune up.