Resolved 1 O2 Sensor?

[NeWyoRksPLaYaZ]

Hey guys, I noticed while looking for a good spot to mount my wideband o2 sensor that I only have 1 o2 sensor in the middle of the car right before the resonator. Arent there supposed to be 2? Also my car is running slightly rich and i dont have any fuel mods done which is confusing.

also if there is supposed to be one, where does it go? because I have no hole for another one. I do have 2 holes that were welded shut on the downpipe(idk why but I bought the car like that). Lastly my gas mileage sucks..really bad

 

[gofer]

The upstream o2 sensor is located in the o2 sensor housing, not sure why they called it that , that bolts to the side of your turbo. Spotting the front o2 sensor threaded into it shouldn't be very hard, the wiring for it comes across the top of the exhaust manifold and then goes into the back of the sensor.

Your shitty gas mileage could be because that front o2 sensor is bad however, what else is done to that car? If you've got upgraded injectors/fuel pump and a bad tune, or no way to tune, then replacing the front o2 sensor isn't going to do anything.