What would cause a 2000 Pontiac Sunfire to not start?
Before you go out and spend money on a new battery. Check this do you have headlights? Are they very dim? Do you hear a clicking sound when the key is turned? Get a boost from someone to see if it will start. If it does then. Put your battery on over night charge (trickle charge). If you find you are still having problems then look into buying a new battery (Most auto stores will load check ur battery for free) I just dumped my battery for just this problem and bot a Motormaster Eliminator (which according to ctc doesn't fit my carrier - its does just a little tighter fix)