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Q: Car intermittently starts after changing Camshaft/Crankshaft on 2003 Nissan Altima

Changed both Camshaft position censors (Bank 1 and 2) and also the Crankshaft position censor. Car ran a couple days without incident then could not start after driving about 8 miles. Have started again after waiting about 30 minutes. Does the ECU need reprogramming?
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No the computer won't need to be reprogrammed .I have seen the sensors fail and wiring harness fail. A professional grade scan tool allows key engine sensor data to be analyzed right off the scan tool without having to do intrusive testing at each sensor.I would check the basics first but look for and verify fuel pressure and spark when the engine fails to start. I would test the computer for inputs and out puts when the car won't start. 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. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
If it did come down to a computer problem a company in Livermore CA, Fuel Injection Corporation can test and repair the computer for you, but you need to do proper testing before jumping to any conclusions.
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