Just picked up a 2005 HCH from a used car dealer with 140k miles and the IMA battery just replaced. While test driving it I noticed the cel was on and that while turning on the car the Maint Reqd light blinks. I believe the car drives excellent,which is why I purchased it, contingent upon the dealer resolving the codes. The IMA light does not come on. I saw a TB referring to the P2000 code. Could be O2 sensors, cat, or a software update from Honda? Anyone experience these two codes but their vehicle drives fine? Is it possible the computer needs to be reset?

Also I'm getting 42mpg, driving very conservatively. Seems like I should be getting more using these techniques.

 

That is, techniques I read on hypermiling, etc

 

On my 05 the maint required light comes on when it's time for an oil change