I have a '01 ram 1500 3.9L and have done a diagnostic on my truck and it says i need to replace my o2 sensor on bank one. having 165000 miles on my truck i just decided to replace all 3 of them. I have found the two near the C.C. (of course these would be the ones that are still good) I cannot find the third one that should be on the "drivers side" any ideas on where to look. i have taken off my air filter and its not behind my intake from what i can see and its not on the pipes anywhere. Please help i dont want to go to a shop for something i can do myself.

 

I didn't know they had 3 O2 sensors. Dang. That'll get expensive quick.

 

I do not know of ANY code that states REPLACE a sensor...
do not use a one size fits all wire yourself replacement....

so lets fix this....
post the code you retriveed p0xxx....

will post dia gtg

 

If you only have two sensors, in front and behind the cat. converter it wil be the front one.

 

They usually only have two of them I thought.
When can go down to Auto zone and have them double check with there computer and I also that you have them reset it and that usually fixes the problem right after you have replaced both of them.

I try that first.

 

Autozone and dodge confirmed i have 3 i already replaced the two i found and had my codes cleared it made it about 30 miles and crapped out again. No one seems to know where that third one is and i dont wanna put it in the shop just because i am having a hard time finding it.

 

code was?

Half this post is lost my message disapperaed ... BUT knowing the code will help .....and Laramie 1997 has a good question???

 

I Thought the California rams had 4? 2 precats and 2 post cats? Being a truck built for sale in cali is really the only reason you would have 4 O2 sensors. IF you swear you have three, we would love a copy of the build sheet.
I would start looking on the driver's side section of the exhaust, but I really don't think you have more than 2 sensors. Never trust what a dealer tells you.

Hell, the dealer up here couldn't even tell me where my AATS sensor plugged in at.