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I have a 2003 fx45. It starts and runs fine unitl cold weather. I live in Northern MN and the temp dropped to -10 below this week. I went out and the car started right up. I drove it for about 3o minutes, shut it off, went out after a couple hours, turned the key and nothing. It was as if the battery was disconnected. I checked all cables and they were fine. I went out 4 hours later and the car started up. This has happened numerous times since then. It will start when cold but when it is warm it is as if there is no battery. I did have a code for a throttle position sensor; would this cause the symptoms?
 
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