oxygen sensor replacement

[kabiner]

i got a 2007 maxima that i believe that my oxygen sensors are bad due to the fact that my gas mileage went downhill and that a bad smell is in the car every time i press the pedal almost all the way. please if anyone has a diagram of the location of the oxygen sensors and if thats the problem thats causing my car to give bad smell and bad gas mileagethanks nico

[loystock]

Your car should still be under warranty - Basic is 3-r/36K miles while Powertrain is 5-yr/60K miles. Take it back to the dealer for diagnostic. It's too early for an O2 sensor to fail. Besides, a defective O2 sensor will trigger the CEL and give a fault code.