I got the code 0901 which is FR O2 SEN HTR B1. I know this is the Front 02 sensor heater, but what is the B1? Also where is this located on the car? And how much will it cost to get a new one? Thanks

 

if memory serves me correctly the front O2 is at the front downpipe part of the Y-pipe.
price is prob around $105 bucks or so..at courtesy nissan
Dan

 

I think the heater is bad not the sensor hence the HTR in the ECU code

 

Bank 1 maybe. I remember reading something like that in the FSM. There are two o2 sensors on the y-pipe. One on each side. It's just telling you which one.

 

Before you replace it,
I think there was a recall by Nissan on o2 Sensor in 95' Maximas. Might wanna check and see if your car has been recalled. Again, I am not sure about this.

 

 

and had the same code if I rememeber correctly, it was the O2 sensor closest to the oil filter. Very easy to change took like 15 minutes tops, get the O2 sensor from Courtesy for about $65. Remember to screw in the O2 sensor first on the exhaust manifold first before plugging it in to the wire harness to avoid twisting the 3 wires.Good Luck !!!!!!