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The Dodge Neon has an Interference engine. That means when the timing belt breaks, you likely have bent some valves. You will need to remove the head, and have the valves replaced. Best done by a qualified mechanic that knows how to replace the timing belt.
I never had a problem with the cam sensor in my neon, drove it for 10 years. However, the O2 Sensor fault tends to send a signal that a bad Cam sensor is present and if the timing belt is lose or jumps that will send a false code. The timing belt on these uses a spring tension device in the 2000 to 2003 and a hydraulic tension arm in the 2003 and later models. The hydraulic tension assembly tends to hang and allows the timing to be erratic. Not enough to throw it off all the time, apparently when the belt pops it comes free, but that is all it takes to through the cam timing off and that causes the computer to send a fault signal or random misfire signal. Look at the Timing belt after replacing the O2 sensor if the O2 replacement doesn't resolve the problem.
Edmonds recommends after 100k miles to replace timing belt at a cost of about 51 dollars USD, as well as oil filter and engine oil see this site for more information
The alternator is more than likely bad. If you jump start all the time and the car dies quickly it is the alternator, if you jump start all the time and it runs until shut off, but will not restart it is the battery.
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