P0171 = Bank 1 system too lean
P0172 = Bank 1 system too rich
Kinda a contradiction, eh? These have to do with the 02 sensor readings. Bank 1 is usually the side that has the #1 spark plug...whichever side that is. ON your vehicle, it will be the right side(looking from the front of the engine).
The codes are telling us that the readings the sensor is getting is erratic, showing it too lean at one point, and too rich at another time. This doesn't necessarily mean there is a problem with the 02 sensor(s), but that the PCM is seeing readings that are not consistent with what it expects to see.
If the reading is showing a lean condition, the PCM will command more fuel...if it shows a rich condition, the PCM will command less fuel.
Check for vacuum leaks, the PCV valve, and around the EGR valve for leaks. Bad/questionable fuel can also cause these codes. One or more fuel infectors that are not operating properly can also do it, as can a faulty MAF sensor. Even a leak in the exhaust can set these codes.
The diagnostic chart is fairly involved, and requires being able to access engine data on a scam tool...might be time to take this to a qualified shop for diagnostics, and repair. First check it really well for vacuum leaks, and exhaust leaks, especially around where the pipe bolts up to the manifold.

hth

thanks for the info -- Time to look for leaks, especially before the snow flies this weekend.

Did you find a fix for this yet..if not pull off the EGR valve and clean it out..these codes together point to it..its been a while since I worked at Honda so I don't remember if this EGR is electric or vacuum..if it is a vacuum style push up in it and see if it holds vacuum by holding your finger over the port..it shouldn't move..if it doesn't spray carb cleaner in and on the pintle..maybe pick at it with a small pick tool..watch that crappy gasket they use..it falls apart and you may not be able to re use it..make sure the pipe on the intake is clear that it bolts to..when you put it back on if it idles rough rev the engine to clear it out..if it doesn't you just found the problem..replace the EGR valve..
Rich