Honda Repair: 2003 Accord V6 Coupe - o2 sensor ?, air fuel ratio, obdii code reader

Question
Hello,

My Accord is just over 60k so it is no longer under warranty. The engine light came on. I have an OBDII code reader but it can only diagnose the codes. The code is:

P0134 Air/Fuel Ratio (A/F) Sensor (Sensor 1) No Activity Detected

Do you think that it is worth replacing the sensor rather than bringing it to Honda myself because they will charge me $100 just to diagnose and then more for the part because there is no warranty. or, with it saying "no activity" could it be the wiring?

Also, how many sensor's are there? I believe there are only 2 sensors? One which I can see immediately when I open the hood in front of the engine and the other after the Cat. Is this true?

Also, if I switch these sensors, will that tell me if it is the sensor, or are they different?

and, sorry, on the generic code, they talk about (Bank 1, sensor 1) How many banks and sensors for o2 are there?

Thanks very much!!!


Answer
With your car being only a 2003 the O2's shouldnt be going out but anything is possible.  

I owuld replace these there not to expensive it is most likeley the one on the eshaust manifold but possible on the other

I would buy one try the exhaust manifold one and see if your still throwing that code. If you are you know its the other one.

Good luck