Contour Enthusiasts Group Archives Forums Modifications Duratec Maintenance O2

I just picked up 3 O2 sensors i was wondering if any one knew witch one is for what i have 3 O2 sensors and 2 part numbers 75-2794 75-1650?

The primary & secondary O2's have different plugs. (i.e. once you look at your's it should sort itself out)

Other then that you may want to let people know the brand of O2's you are inquiring about. By the numbers I can tell you they're not OEM, Bosch, or NGK.

It would also help to know what kind of car you are working on, you know, the standard questions that the parts guys like to know too. Make, model, year, type of engine, type of trans, etc.

they are car quest O2 and it a 96 mysitque v6 5 speed

Your 96 V6 would have 4 oxygen sensors. Two for each bank. The two in front of the cats in the exhaust manifolds (upstream sensors) are the two that are used by the computer as the main source of information for fuel mixture control. The upstream sensors are the ones most likely to need replacing. The two behind the cats (downstream sensors) in the exhaust manifold are part of the cat monitoring system used by the computer to determine the health of the cats.

The upstream sensor on the front bank (bank 2) is reasonably easy to get to. The upstream sensor on the rear bank (bank 1) is hard to get to. Access is by removing the coil pack and working from above.

Both downstrean sensors are reasonably easy to get to, but most likely don't need to be changed.

You should be aware that most of the time you have oxygen sensor codes it is something other than the oxygen sensors causing the problem, especially if it is both sensors. Depending on what you are trying to do, you may need to do more diagnosis. I would try to diagnose it before changing parts.

Ive all ready done the "hard" O2 sensor it was pritty easy thanks to the form know i am have to do the other one

If or when I need to replace the O2 I might do it during an oil change. I notice that once the filter is out of the way, the upperbank o2 isn't to hard to get to. Of course I'm not to keen on leaving the spot for the oil filter exposed either...kind of a toss up.