A bad O2 sensor will not necessarily set off a CEL on a Honda, but it can be sluggish and waste fuel / performance.
I checked the part numbers for my CR-V on this site:
For hondas over 100,000 miles, an O2 sensor change might be a good idea. Search back a few days to see this post about __'Revitalizing' Oxygen Sensors ? ?__ if that interests you. google.com has hundreds of good sites about O2 sensor troubleshooting . . . . .
'Curly'