Rough running, Check Engine Light, and multiple codes

[Brian]

After a couple days of wet weather, my engine is running very roughly, more so under power than at idle; and the Check Engine light is on almost constantly. I checked the ECU blink codes. It's giving me 4 codes: 32, 15, 37, 1nd 12. I've been clearing codes between checking, and all 4 come up all the time. I can't believe that I really have 4 different problems all at once, so I'm trying to determine the real issue. 12 = Starter switch, but I'm not having any probems starting. 32 & 37 are the two O2 sensors, but I doubt both would fail simultaneously. 15 = Fuel injector #2. (I've had coil #2 relaced relatively recently.)

This summer I had a similarly rough engine running, and Tom fixed it by replacing the #1 spark plug and injector. I will start with fuel injector cleaner, and see if that helps anything. But if the problem is with the #2 injector, plug, or coil, why would I be getting codes from the O2 sensors on both sides?