down stream o2 sensor question

[tboostndsm]

I have a question for the smart dsm tuners out there.I put a custom 3" exhaust on my
95' gst and after it was on I noticed that there wasnt a hole for the downstream o2 sensor; the one after the CAT-.I do have an air/fuel ratio gauge, but I want to know if
not having my downsteam o2 sensor connected; messes up the reading Im receiving from the computer to my air/fuel gauge.THANX for the help its appreciated!!

 

[Blk_99gst]

No, the 2nd o2 sensor is only there to make sure the cat is working. Its voltage is not used for any type of fuel control. Your front o2 sensor is used by the ecu for fuel control and is the one your air fuel gauge is tapped to.

I wouldn't go just snipping off the 2nd sensor. If you can, put it in the exhaust still. You might get a random check engine light for cat efficeny below threshold, but that will happen if you run a test pipe.

 

[My96AWD]

leave it out and wire it up somewhere. don't put it back in unless you wrap it with tinfoil.