Actually, the OBDII codes tell you..
Hi. PO130 is "O2 Sensor Circuit Malfunction, Bank 1, Sensor 1"
Sensor 1 is the sensor closest to the engine, before the cat.
PO170 is "Fuel Trim Malfunction". The fuel trim is set by the engine computer (ECM) above or below the factory mean by a small amount based on the feedback from the O2 sensor.
I'd replace the forward O2 sensor and clear the codes. I'm guessing the bad sensor is causing both codes.
If one of the techs is reading, and I've got this wrong, please leap in.
Sorry, can't help with your last question.
Hope this helps, KenP