95 voyager code questions

[tempfixit]

95 Voyager 3.3 engine 4 speed automatic 208,000 miles.
Friends vehicle, the check engine lite has come on intermitently. Checked codes are:

12- (disconnected battery) I know the battery has not been disconnected. I will try cleaning up battery cables and posts, seems like on this vehicle this needs to be done more than usual. Could this be a bad ground someplace??? This code has me stumped.

32- (2 seperate codes) Short or open in the EGR solenoid circuit. I will check the connector for looseness. Engine runs fine no problems, mpg seems to be the same.

Any ideas, thanks

[RIP]

Don't knock yourself out on the code 12. It will not make the check engine light come on. It means the PCM had a power interruption in the last 50 key cycles usually caused by disconnecting the battery. Since you haven't and all is running well, I wouldn't sweat it. At most check the battery as you're planning. On the rare occassion I check codes on my van it always has a code 12 and runs just fine.

Code 32 equates to a scanner code P0403. Here's the skinny: http://www.obd-codes.com/p0403