Nissan Altima: 96 Check Engine Light

Hi
I'd make sure your alternator isn't the problem. Measure the voltage on
the battery with the car running -- it should be around 14V or more.
Also be sure to check the connection from your alternator to the
battery as maybe you, while replacing the battery, caused a contact to
loosen.

Hope you get it soon.
Remco

Just to clarify my previous post: check to make sure your alternator is
working right so you know you can drive the car and restart it.
Once you determine that it is, go to pepboys/autozone -- they'll check
what code causes the problem.
It could just be a fluke that happened once when the battery was low
and the code may need to be reset.
Regard,
Remco