PO131 PO151 PO154 - 2000 Nissan Xterra

P0031 and P0051 02 heater control, P0131, P0151 and P0132 02 voltage P0748 pressure control solenoid a electric. Your 02 sensors not problem, problem is electric in nature

the po300 are multiple miss fire the others are related to the o2 sensors

Have you checked the fuel pressure, if not do so.

Hi

Please check the link to get a detailed idea about the code:-

http://www.obd-codes.com/p0421

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hi, this is an article of po154 interpretation, I think after looking this you can understand the meaning of po154.
and I think this tool can help you clear the code.
hope help.

Not the fuel filter

More like a vacuum leak

These codes relate to your O2 sensors - did you change them?

P0131=O2 Sensor Circuit Low Voltage Bank 1 Sensor 1
P0151=O2 Sensor Circuit Low Voltage Bank 2 Sensor 1
Marc,
this shows that the oxygen sensor on the left exhaust pipe before converter is bad,
And the front oxygen sensor on the right exhaust infront of converter is bad.

You're right, the PO154 has to do with the O2 sensor. The code has the info of Oxygen Sensor Circuit No Activity Detected (Bank 2 Sensor 1).
Bank 2 is the exhaust manifold that cylinder #2 uses.
Sensor 1 is the sensor in BETWEEN the exhaust manifold and the catalytic converter.
No Activity Detected in the circuit could mean the O2 sensor is dead, or an open/cut wire going to the sensor.
That's about all the info you can get out of that code PO154.

its a shorted out o2 sensor