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P0150 - O2 Sensor Circuit Malfunction Bank 2 Sensor 1 Possible causes:
Faulty Front Heated Oxygen Sensor Bank 2
Front Heated Oxygen Sensor Bank 2 - harness is open or shorted
Front Heated Oxygen Sensor Bank 2 - faulty electrical connection
Fuel pressure not right
Faulty fuel injectors
Intake leaks
Exhaust leaks
P0150 = O2 Sensor Circuit Bank 2 Sensor 1.
P0300 = Random/multiple cylinder(s) - misfire detected.
P0304 = Cylinder 4 - misfire detected.
You will need to get the car locked at in more detail to find out what it actually is.
You will need to recheck the P1931 code as I cannot find it listed.
Bank 1 is always the same side as the number one cylinder. Bank 2 is the other side of the engine. Sensor 1 is always before the catalytic converter and Sensor 2 is always after the catalytic converter.
codes 130 and 150 indicate a malfunction in the upstream oxygen sensor circuit which is affecting both oxygen sensors. This fault does not directly pinpoint the o2 sensors as defective, more diagnosis must be performed to get to the root of the problem. You could have a condition where power is not reaching the sensors, causing them to appear dead. There may be a fuel or airflow related issue causing the sensors to report abnormal readings.
To answer your question, the o2 sensors in question are between the engine and the cat convertor in the exhaust. Whether or not changing them blindly will fix your problem is another question.
lambda probes are fitted between the exhaust manifold and the first box(cat)cannot miss them as no other part of the exhaust system has wires coming out of it.
Some time when you got new sensor s they have to be coded so the cry recognise them and some after market items aren't as good so try and get an oe part.
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