2 Front O2 Sens. Locations Please

Hi, can someone please tell me the exact location of the 2 front O2 sensor locations, and also is it true that the 2 rear O2 sensors won't affect perfomance or gas mileage? Thanks,-------Paul

If you disconnect the rear sensors without plugging in some sort of O2 simulator module your mileage will drop. Your front O2 sensors are located in front of the Cats, just follow the exhaust pipe. They won't be anywhere past the exhaust manifold/pipe flange though. -Chris

Thanks Chris, I am just going to replace them all, their almost 8 years old, and the guy who owned the suburban before me just let it sit for a long time, I have been replacing stuff a little at a time, now the brakes got to go, I need some REAL front brakes.