billyb,
More specific information about your engine will be required, but I assume your ford is a 2008 and a V8. In that case I would very surprised if it does not have a heated O2 sensor, as these are almost always used in these later vehicles and used to bring the internal exhaust components up to temperatures quicker, so the emission and fuel system goes into closed loop faster and consequently reduces exhaust emissions being emitted into the atmosphere.
For many years, the automotive industry has been using two O2 sensors for each catalytic converter, and there will be a converter for each bank of your V8 engine, one being called the upstream sensor (in front of the converter), and a downstream sensor (behind the converter).
As for position of location of the sensors, generally speaking the bank identity is related to the side the #1 cylinder is on, so in the case of your Ford, it should be the Passenger Side of the vehicle.
But, prior to doing much work, you should analyze your system with a OBDII scan device to find out what active and pending codes have been set in you PCM (powertrain control module) better known as the computer. Because there likely other things that can influence O2 code, and an O2 sensor may not be the actual cause of the check engine light coming on.
These O2 sensors are readily available from parts supply houses, ie O'Reillys, Auto Zone, NAPA, ETC., and with motorhomes, you may have to advise them that it is for a bare chassis, since it is not specifically a common F150, F250, etc.
Hope this helps in your efforts.
Happy RV'g
Jack
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