loosen the center bolt of the a/c idle pulley, then on top of pulley you will see the adjusting bolt, turn to loosen to remove belt, after new belt , tighten to where you have 1/2 play on elt then tighten center nut of pulley
I had this problem and nobody could figure out the why. After searching on the internet, I found the problem was coused by soldering issues on the circuit board for the gauges. My husband was able to resolder according to the instructions on a web page found at Neon.org. Search for speedometer and use 1st gen for the forum to search. This will bring results regarding fuses and resoldering. Unfortunately, the resoldering that was done only lasted about a year.
fuel cap is just one of the causes. Here are 2 others:
possible vacuum leak
NVLD switch is stuck or malfunctioning
NVLD switch communicates with your car's computer. A bad switch will throw a P0457 error code. Check for a vacuum leak 1st but if none is found, the NVLD switch should be changed. Below is a link that explains more thoroughly what the module does; I do wish you the best of luck with your Neon and hope you found this information helpful. Take care! http://www.search-autoparts.com/searchautoparts/article/articleDetail.jsp?id=377511&sk=&date=&pageID=3
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