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Q: Why does my car not start. Why does my speedometer dial go crazy? on 2005 Saturn Ion

I have a 2005 Saturn Ion with less than 50km on it. In  Nov 2009 for some reason the car would not start - it was winter and was late at night.  We tried the next day and it started.  This happened again during the winter but after a boost it started.  We had the battery replaced in Feb 2010 and from time to time, the Saturn does not start and it's not during winter. We brought the car into the dealership and the said it may be a security feature that prevents the car from starting - that is we didn't insert the key in properly. I am no expert but I don't buy it.  After all the years since we had the car, we don't know how to insert the key to start the car?  Also,  the dial on the speedometer goes crazy while driving as it sways back and forth.  What is wrong with the car? How much wwould repairs cost us- best estimate appreciated without seeing the car.  Winter is approaching and i would hate to have an unreliable car.  Should we replace the car? Thanks for your input.
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It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. How frequently does this happen? To diagnose what is wrong the car would have top be got in a failing state, with a scan tool attached when the car is cranking over you could read live sensor data and see if the computer in you car is seeing crank angle sensor input and other sensors. I'm not sure what diagnostic capabilities the anti theft system has on a Saturn. There is a professional service called Identafix. They only deal with professional repair shops. They are in the Minnesota 651-633-8007 begin_of_the_skype_highlighting 651-633-8007 end_of_the_skype_highlighting. Your auto repair shop do all their diagnosis tests, and discuss your problem with a team of professional technicians great service cheap and very bright people. If the repair shop that are repairing your car are stumped this is a great service. This company only deal with automotive repair shops and don't answer questions for the general public but are an amazing knowledge base.
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