Is there a trick to make O2 simms work? I bought some (part#104047) for my 2000 5.3 and put them on. After installing them I looked at them with the diagnostic part of my predator & they were showing ~420millivolts so I thought cool they work. Then I drove around the rest of the day without a light, the next day when driving around the light came on, WTF.

 

Check the wires,on the 104047 there is a pink wire in cavity "D" that will match up to the same wire on the
plug. The 104049 is the same but the pink wire is in
cavity "C".The 104049 worked on mine,wires were the same,but I had to cut a small ear off.I've got a 2000 silverado.
Check this out

http://www.installationinstructions....structions.pdf

 

did you unplug the battery for 10 mins. then start the truck back up that should take care of the problem if you have the right simms.

 

Thanks for the response guys.

I compared the o2 sensors on my truck to the simms I have & the pink wire didn't match, so I swapped the the pink & black wires in the o2 simms & reinstalled. I then drove the truck to the bank to get some mulla mulla and by the time I got home I got a SES light, so I reset the code. Today I am going to drive it around & see if I still get the SES code and if it does I will try disconnecting my battery for an hour to see if that helps.

 

There is a small led light on them,when you start her up
look and see if the lights are flashing.If not the simms may be bad.

 

I'm not aware of a light on mine. Of corse after asking the same question as above, this is the most info we have gotten about this problem. That's why mine are off right now.

 

I noticed a red led on the simms but I haven't seen it light up yet. I wonder if it only lights up when the heater circuit for the o2 are activated or does it light up all the time when the vehicle is running.

 

It lights up all the time,with the key on or the truck running.What color is the plug on the simms,black or white?I would send it back and get a 104049 and cut the small ear off,it should work.But check the wires first and make sure they match,thats what I done.I even put it on my 2002 truck and it worked fine,

The lights are at the oposite end of were the wires go,it looks like a little
bubble in the plastic stuff they use to seal the wires up.

 

So I have the wrong ones....bought them used and tried to make them work. But by that picture, it looks like I found my part. 104036 looks like what I need.

 

Yea,but wait look at the ears on the 104036 and the 104049.There on the wrong side,I think 104036s are for 96 through 2000 (old body).104049 would work for 2000 and up,dont know about the 99s.You just have to cut the small ear off for the 2000s.