Cat Convertor Sensor

[s13silady]

i know that most o the new cars have a O2 Censor in the Cat
would anyone know if the 93 s13 would ave one?

[bbp]

The second sensor is located just after the cat.  I don't think your car is equipped with this, I think this is part of the OBDII emissions system.  It reads the emissions AFTER the cat to make sure it is working properly.

My 95 has the second sensor.

[boosteds14]

yes, 97's also have this. if u take it out or disconnect it u will get a check engine light but it will not harm the performance of the engine

it is used for emissions reasons and to check that the front O2 sensor is working properly.

jeff