whos got the hookup on o2 sensors

[Formula Z]

and which ones are best for my car?

part numbers please also if available

[OIF1VET]

Is there a difference between the front and rear 02's? I have a set of rears with only a few k on them.

[Formula Z]

i dont know

[sman]

Get vette o2's. Ive tried factory ones with extensions, ive tried extending the factory ones (a different set), and after screwing around with problems with them not switching I bought a set of vette rear o2's, solved all my problems and fit good.

[TrickyTransAm]

Oxygen sensors should be matched to the PCM. The voltage range delivered by the 02 sensor to the PCM's table will be wrong if you swap in a different 02 sensor than what the PCM expects to see.
This could lead to inaccurate readings and a dangerously rich/lean condition depending on how much the voltages are off.
If you do swap - make sure you compare the reference tables within the PCM.

I kept my 5.3L sensors on the 6.0L so that the PCM voltage reference points were the same - one less worry.

AC Delco is the only brand O2 sensor I will buy as I have not had luck with Bosch 02 Sensors.
I shop on Amazon for my sensors as they are cheaper.

AC Delco O2 sensors underwent a change. The old sensors had a thick large round body. The new sensors have more of a narrow almost hour glass shape.
This is an easy visual way to verify if they have been changed in the last 3 years.
They should be changed every 100K Miles.

The Front Oxygen sensors are what the PCM uses to adjust Air/Fuel ratio.
The Rear Oxygen sensors (Post CAT) are used as reference only, and many tuners shut the rear off because they are only used as a "Sanity" check for the PCM.

I would provide a part number, but need to verify what PCM you are using, and what engine it originally powered.
98 Formula LT1:
AFS123 RH bank
AFS98 LH bank

[Formula Z]

98 pcm originally powering a 98 5.7 ls1

[c0ncEpT]

Bosch 13111

[sman]

Bosch 13111

Bingo

[Formula Z]

Is there a difference between the front and rear 02's? I have a set of rears with only a few k on them.

anyone?

[Curt_irocz]

none.

[DETROITMUSCLE]

I run Bosch vette rears, never had an issue and they have been on the car for about 5-6 years, the harness is longer already too so no need for any extensions.

[Formula Z]

so larrys rears should work then???

[WMCCjames]

13111 here too..NAPA carries them

[Formula Z]

going to get larrys slightly used rear o2s

[TrickyTransAm]

Bosch 13111

Are you sure? I'm looking at a 13444 for the 98 LS1 unless my guide is wrong...

I checked 2 sources. Advance-Auto and Rock Auto - both show 13444.