96 dodge ram 1500 5.9 .. how many 02 sensors are on this thing.... i came up with p0171 and replaced the back o2 sensor because it was unplugged when it came into the shop.. was all corroded... reset it.. went thru drive cycle.. and it came up with code again.. i pulled the front one before the cat.. i dont see where there is any between manifold and cat.. i see jsut the one that is almost ON the cat.. looks like both sides of exhaust use this one.. am i correct in this??

 

most trucks have only 2, 1 immediately before cat and 1 immediately after.
i've heard/read that california versions have 2 cats and 4 o2 sensors.

 

my 96 has 2

 

awesome.. thanks guys.. i have the o2 sensor ordered for the front .. will have it replaced in the morning.. i hope like hell this fix's it.. i love the truck. but want it outta my shop

 

I've got a persistent P0138 code which means oxygen sensor 2 in bank 1 is too high--does that mean the after-cat sensor? My pre-cat sensor is only 5 months old and it's a dealer piece--surely it isn't going bad yet, right? The fact that it says bank 1 suggests that perhaps there's a sensor on each bank? I haven't crawled under there to have a look, but I'm doing an oil change today and I'll see.

 

Thats correct. That code is for the o2 sensor after the cat. i have the same code. the light just doesn't bother me enought to spend $75 on the new sensor

 

Thats correct. That code is for the o2 sensor after the cat. i have the same code. the light just doesn't bother me enought to spend $75 on the new sensor

 

Thanks! I'll wait until it starts to cause problems before spending the cash.

 

You'll be waiting a long time cause it really does nothing but monitor the efficancy of the cat.

 

It should, because it's telling you something is wrong. Not spending $75 could lead to spending three times as much down the road, where you'll really be bitching.

Treat your truck right and don't be cheap.