Would anyone be able to tell me where the o2 sensor is location on the 97? 3100. I think I've asked this once before but I don't remember. The code p0141 has come up 3 times now and its time to get it fixed.

 

Theres 2....

One before the (between the manifold and cat) Catalytic converter and 1 after...

 

Keane, I believe your '97 has a 3100? The upstream should be right on the rear manifold (look down and behind the coils). You can get to that one from up top.

And as David mentioned, the other is just after the cat.

I don't recall if your code is referencing the upstream or downstream O2....

 

You're going to have a hard time getting to it I think. Take off the dogbones and rock the engine forward to get to the O2 sensor on the rear manifold

 

Any idea which might be bad? or is it just a 50/50 shot of getting it right? p0141 was the code.

 

Keane,
If i'm not mistaken... on a 3100,
It will be the o2 sensor behind the cat..

 

OK, I just punched it up. That is code "DTC P0141 HO2S Heater Performance Sensor 2" and Sensor 2 is after the cat. If the 5th gen is anything like the 6th gen in that respect, it's a big annoyance. In the 6th gen, that sensor stands up in the u-bend and you have next to no room to work.

Side bar - Unless I am missing something, the upstream sensor on the 5th gen 3100 should be on the rear manifold. On the n-bodies, I had to usually take the coil pack bracket (with packs and icm) out of the way. I did that same sensor on my wife's 3400 '05 Impala (basically a 4 door 6th gen Monte) last year and it was a piece of cake (no need to move the coils, lots of room, zero need to rock the engine forward). Not sure if the 5th gen is a bit tighter there...

 

When I had the 3100, I had to remove the dogbones just to change the back 3 spark plugs. Wbody 1.5 gen is a tighter fit than Wbody 2nd gen

 

I have 2002 monte carlo ss with about 160,000 miles about a month ago I started to have this hesitation when I would accelerate I would keep my foot on the gas and rpms wouldn't go up till I let go of the pedal.can anyone help

 

Possible faulty TPS..(throttle position sensor)
Try removing it..give it a through cleaning and reinstahl it. See if that doesn't fix the issue.