P0300, P0174, P0136 where the codes, Cleared them then it read P0300,P0138

Question

Whats the difference of sensor one and two for the described problem.

Answer 1

P300 Random misfire,

P0174 Fuel trim too lean (bank2)

P0136   02 sensor circuit malfunction bank 1 sensor 2)

P0138  02 sensor circuit high voltage (bank 1 sensor 2)

Here is what is happening you have a random misfire, was caused by a lean condition such as vacuum leaks  or low fuel pressure, to a blown out fuel pressure regulator leaking fuel into the intake. 02 sensor which bank 1 sensor 2 is catalytic monitor sensor.circuit high means its not working it probalby disconnected, thats fine but disconnection will cause high circuit malfunction so would a plugged catalytic convertor.which also causes a random misfire. So 2 things to be concerned about go to the pressure regulator,pull the vaccum hose see if fuel comes out where vacuum should be at and this is the source of random misfire, Othere than that you may be dealing with a plugged catalytic