I just did a self diagnosis, and the car said that my front left heated 02 sensor is bad, can anyone tell me where i can find that sensor and how to replace it?

 

Reset your ECU, the CEL light should go away. If it doesn't come back on again, then no problem. If it comes back on (same ECU readout) then you'll need to buy a replacement sensor (ie, Courtesy Nissan etc.) It's not cheap.

Ange

 

I replaced mine mine last summer. It's located on the passenger side close to the manifold. It's hard to explain exactly, but if you have access to a Hayne's manual I believe it shows a photo of the harness, and then you can follow the wires to the sensor. This part is fairly expensive compared to the rear O2 sensor which I replaced at the same time.

 

go here: http://www.courtesyparts.com/A32_O2-sensors.html

It shows a picture of the exhaust and where the O2 sensors are located.