Title pretty much sums it up, i had to work with the doors open and electric bits so I disconnected the battery (twice, connected it up to check and took it back off again) and after I put everything back and went for a ride the CEL came on. The car was running find, great idle and everything was normal. I have had the car for almost a year, i do regular maintenance, I just had the oil changed 2 weeks ago. I cant think of anything else that I did that would suddenly cause a CEL...

 

What part were you working on?
Swing by an autozone and see what code is pulling up.
Also, how long have you had the maxima for?

 

Please just check the code first.

 

I have had this happen and it goes away after a day or two.

 

i just did the ecu fault code test and it only came up with P0651 and the only thing that i could find on google was: P0651 Sensor Reference Voltage B Circuit/Open...

 

Clear the code and see if it comes back.

 

Yes you can do that. The code does not seem to be available (applicable?) for Nissan. It's not in the 2006 ESM for instance.