Ok ive searched everywhere about the differences and specifics of these two different styles of O2 sensors.
This is dealing with the Gen III trucks/SUV's.
From the schematics, it looks like in 1999 they only used 4-wire case-grounded O2 sensors.
Then in 2000-2002 they came with either 4-wire case grounded or 4-wire isolated grounded O2 sensors.
Then in 2003, they switched to only "one" style O2...but I cant find anywhere if that "one" style they used from 03+ was case grounded or isolated ground???
Why are there the two different styles?
The engine is a 1999 4.8, so it has 4-wire case grounded O2's.
The PCM/tune is a 2004.
Basically my question is...does the PCM care what kind of O2 sensors its getting readings from?
Say for example the 03+ O2 sensors were all isolated ground...if I hook up my 1999 case grounded sensors to the 2004 PCM (that, in a factory application, is normally reading from isolated ground sensors), is that going to cause big problems???
Basically...id like to reuse these good 1999 4-wire case-grounded O2 sensors if possible with my 2004 PCM...that way I dont have to go out and buy 180 dollars worth of new O2 sensors for a "2004 4.8"
thanks
ben