Oxigen sensor bank 2 cyl 2: How hard is it to fix this problem and does anyone know how much it cost to have it done: Code P0156, 1999 F150 5.4L Triton v8

 

What Does P0156 Mean?
Your car has oxygen (O2) sensors that measure the amount of oxygen present in your exhaust. ... If you are seeing code P0156, it means that the O2 sensor behind your catalytic converter on bank 2 is malfunctioning.



So, the exhaust comes out of the engine and there is a sensor that detects the air/fuel ratio, this would be Bank 1 or Bank 2, Sensor 1. These are an important part of engine management, but not your problem.

After the exhaust passes B1S1 and B1S2, it goes to the respective CAT, where there is another sensor that detects how well the CAT is doing it's job. You should be easily able to see the B1S2 and B2S2 screwed into the exhaust system after the respective CATs. Depending upon the clearance, you can get to the with a socket that is the same size as a spark plug socket, but has a side cut out to the wires of the sensor have somewhere to go, or maybe yo can use an open-end wrench. Replacing a sensor is pretty easy, there's usually no reason that you cannot do this yourself in your driveway. The sensor can report that the CAT is not working well, this would be a code of P0420/P0430, and could be the result of an exhaust leak or the CAT has finally worn out. You have an error code that means that the sensor is not working. Bank 1 is on the right side of the engine (passenger side), Bank 2 is on the left side. (Left and right are always referenced from sitting in the driver seat, looking forward.) Bank 1, in any engine, is the bank that contains the #1 cylinder. #1 is the cylinder that is at the very front of the engine.


CAUTION
Do not use a "universal" sensor that has to be spliced in. Sometimes they will work perfectly, but since you had to ask, it stands to reason that it won't work for you and the chaos that they can create far exceeds the value of using them. Buy the sensor that the guy at the store says you need. Even better, take your sensor to the store and tell the guy you need another one.

 

All well and good but look at the description.
It says >circuit<.
Inspect the plug and harness first before replacing the sensor.
Is it worn through? Grounded, open, crossed or burnt from the exhaust?
Good luck.