With a "laundry list" of codes, the best place to start is to distinguish between KOEO and CM codes (both types of codes are output during the KOEO test). Diagnose and resolve the KOEO codes first. Of the codes listed, all must be CM (or KOER but you indicate that you haven't run the KOER test) except for the 556 code, which can be either KOEO, CM, or both. You might review my "notes on pulling EEC-IV codes" thread in the EEC-IV forum. In short, the KOEO codes come out first, followed by a separator pulse, followed by the CM codes.
556 refers to a fault in the fuel pump circuit. If it is a KOEO code and the engine won't start, you should check the fuel pump circuit to see where the break in the circuit is. If this is a CM code (pass 111 from KOEO), that suggests an intermittent fault in the fuel pump circuit. If the engine runs fine, then the fault may not be traceable. I used to get one of these off and on for a long time, and couldn't resolve it until one morning when it wouldn't start and I could finally locate the break in the fuel pump circuit.
172, 176, 181, 185 and 186 are all O2 sensor codes. It's kind of a "guess and check" approach, but at 200,000 miles, I'd probably replace both O2 sensors and see if that cleared those codes. An intermittent fault in the fuel pump circuit (possibly indicated by the 556) could also cause these codes if the break is "consistent" enough to have the pump running in spurts. The fuel pump may run enough to keep the pressure up enough to run, but the pressure may be low enough to create the lean condition indicated by the O2 sensor codes. A quick fuel pressure check should be able to identify this situation.
332 is an EGR code. Not sure that I would expect a faulty O2 sensor or fuel system problem to trigger this one. I might look more at this one after resolving the fuel system/O2 sensor codes.
Another thing I might do with a long list of codes like this is clear CM, test drive, and see which codes come back immediately, and which ones don't.
