Suburban 99 Vortec 7400 swap 0411, O2 sensor missing

[ali32109]

Hi everyone,

I've recently completed a swap and the car runs well. To further increase performance, I used VCM Scanner and noticed that my LTFT and STFT are always 0, and the O2 sensor is fixed at around 480. My car doesn't have an O2 sensor, and the pinouts for C1 (25, 26, 28, 29 and 65, 66, 68, 69) have no wires from the black box.

I'm not sure if my car came without an O2 sensor from the factory or if a previous owner removed it.
Since I planning to remove the catalyst from the system, how many O2 sensor need to be add and in which pinout?

Can anyone guide me on where to start?

Thanks!

 

[BeXtreme]

Hi everyone,

I've recently completed a swap and the car runs well. To further increase performance, I used VCM Scanner and noticed that my LTFT and STFT are always 0, and the O2 sensor is fixed at around 480. My car doesn't have an O2 sensor, and the pinouts for C1 (25, 26, 28, 29 and 65, 66, 68, 69) have no wires from the black box.

I'm not sure if my car came without an O2 sensor from the factory or if a previous owner removed it.
Since I planning to remove the catalyst from the system, how many O2 sensor need to be add and in which pinout?

Can anyone guide me on where to start?

Thanks!

The engine will run like hot garbage without at least two o2 sensors. You will need B1S1 and B2S1 sensors installed in order for the engine to be able to enter closed loop and get STFT and LTFT. If you do not have cats, then there is no reason to have B1S2 and B2S2 installed. They are only for monitoring catalyst efficiency. You would just need to turn off the DTC monitoring for those sensors and related catalyst efficiency codes.

 

[ali32109]

Which model can fit?

 

[BeXtreme]

Which model can fit?

Any of the "upstream" ones listed here:
https://www.rockauto.com/en/catalog...17,exhaust+&+emission,oxygen+(o2)+sensor,5132

Personally I'd probably go with the DENSO 2344019 or BOSCH 13027