DTC P0700 is generated by any detected transmission fault. So any automatic transmission problem is going to throw a P0700 and another code.
A/T 3rd pressure switch signal circuit is open
A/T 3rd pressure switch signal circuit is shorted to ground
A/T 3rd pressure switch signal circuit shorted to system power
A/T 3rd pressure switch is damaged or has failed
TCM or PCM has failed
Setting Conditions = Engine running in gear, and the PCM detected an unexpected voltage condition on the 3rd pressure switch circuit during the test.
This code sets in 1 Trip(s).
These transmissions have had a lot of mechanical problems. Honda extended the warranty on the transmission to 7 years or 100,000 miles due to problems. Refer to Honda TSB #02-062 for information.
Clear the transmission codes and see if they return. If they do then repair the O2 and work on diagnosing further the trans codes. Could be a bad TCU for the transmission.