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It is the first O2 sensor you come to on the exhaust system. Usually in the exhaust manifold or catalytic converter. Heater circuits are 99% of the time the O2 sensor...1% is wiring on the harness side..
Your vehicle is being supplied with too much fuel. The o2 sensors are most likely ok. You may have a coolant sensor, tps sensor, map sensor issue. You need to determine why the vehicle is being supplied with extra fuel. The fuel pressure regulator can leak and cause this problem as well. Have the vehicle proffesionally scanned by a mechanic who should be able to determine the source of this issue
To clarify, none of this has anything to do with your a/c.
Code 650 is for a problem with the check engine light circuit.
Code 30 and 134 involve the heater circuit for the O2 sensor in front of the catalytic converter. The O2 sensors have a heater that allows the sensors to start working quickly after you start the engine. The sensor and the heater circuit would need to be tested.
The O2 sensors have nothing to do with your car heater or A/C.
the p0030 is the heater circuit in the o2s bfore the cat. as long as there has been no one cutting through the fire wall(which i have seen) and into harness trying to install a stereo then you should be able to replace the o2 sensor which should still be under warranty. the p0016 has to do with the crank/cam sensor which could be going bad. how does it run? if it runs good or wont start, replace the sensor. happy holidays
They are located on the exhaust system, most cars have atleast 2, the first is the before the cat converter or also known as the up steam o2, The second being the down stream o2 which is located behind the cat converter.
They almost look like a spark plug sticking out of the exhaust pipe with a few wires coming out the top of it.
o2 Sensors can be very costley I would suggest having your local auto parts store such as Autozone or Advanced Auto Parts resetting your engine light, They will do it for free, also if you use some high test gas for your emissions inspection as well as make sure the car is run for a little bit before going to have the test you will find by doing this it will drop all your numbers needed to pass the test.
It is a very good chance that once the light is reset it won't come back on.