I have a GSR motor in a 92 4dr civic and my question is, the engine is currently running without a o2 sensor. It is not connected, but the car obvious drives and runs fine. Is thier anything that I should be concerned??? I heard the motor could be running rich or on a limp mode, but I also heard the gas mileage isnt the best without the o2 sensor not being connected. I would appreciate some information thanks

 

It's going to run rich, fuel mileage will be crap and you will quickly kill your cat.

 

Thanks