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Originally Posted by bonecollector
the OBD II Scanner showed P0135, P0151, P0155 and P0161.
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P0135 = HO2S Heater Circuit Bank1 Sensor1
P0151 = HO2S Circuit Low Voltage Bank2 Sensor1
P0155 = HO2S Heater Circuit Bank2 Sensor1
P0161 = ??
I sounds to me like the heater circuit(s) is/are not working. Without power to the heater element, the O2 sensor is probably not heating up quickly enough and the computer knows it. If this is the problem, simply installing new sensors will NOT solve the problem, because the sensors themselves are not faulty -- the circuit supplying power to the heating element is at fault. This means that one of the wires (the heating power wire) to one or multiple O2 sensors is dead...possible causes include a short, bad ground, or maybe even a bad PCM. Again, if the heater circuits are really at fault (further diagnosis is necessary), replacing the O2 sensors will not fix the problem.
If I diagnosed this at home, I'd probably start with figuring out which wire is the power wire (a factory service manual will be invaluable in this case -- available from Nissan electronically) and checking the voltage to that wire (unplug the sensor) while the engine runs. If one or more of the power wires has no voltage to it, I'd say you're starting to narrow in to your problem.
Good luck,
