Hey there guys and gals!! Never posted here before and I need some help I have a 07 honda fit that I replaced the o2 sensors in about a month and a half ago. Today when I came out to drive it as soon as I started it it revved to 5000 rpm. and would bounce arround there I'm not to sure what is happening....this is my wife's car and she drives it pretty hard....any help would be much appreciated

 

Looks like no one else has any guesses, so I'l tell you what I would do, if you haven't solved it yet. I'd carefully and thoroughly unsnap and re-snap all the electrical connectors to the throttle body area and anything close, and behind the engine. You may have unsnapped something to get at the upper 02 sensor and didn't completely secure it. Sounds like a sensor isn't working. I also do stuff that sounds useless, like remove and push back in the relays that have anything to do with engine control. And check to see that any visble ground connections on the engine are tight. None of this costs anything. Did you already solve it? Anyone else have any ideas?

 

Vacuum leak? Did you disconnect any vacuum lines for any reason?