A google map search of "Chicago computer repair" yields 4,387
results.
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Many repair manuals like Chilton's or Hayes has wiring diagrams.
Additionally they have repair guides for everything else the
vehicle may need.
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It depends. If the sensor is working, just reset the computer.
Otherwise you have to change the sensor.
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For an auto repair shop in Brooklyn visit this website.
http://www.yelp.com/c/Brooklyn/autorepair. There are 6 different
shops within the area and the website provides you with a map that
can help you get to any of them.