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I wonder how well this works with complex problems. Since many new cars run on computers, how to mobile technicians have the equipment needed to diagnose and fix those kinds of issues I wonder?

This would be great for things like getting your brakes replaced.

Also, I wonder how they handle waste disposal of fluids?

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The diagnostic equipment needed to diagnose issues with the car's computer is really small. http://www.amazon.com/Foxwell-Diagnostic-Analysis-Scanner-Re...

Disposal is handled by taking the waste fluids to your favorite parts store.

Like I said, that will help with the easy to diagnose stuff. What about the complex problems, that don't show up on a scanner.

For example, the equipment used to calibrate your air conditioning system. Its more complicated then fill to the manufacturer spec. Newer machines will run the air with a temperature probe, and modify the amount of freon to get an optimal amount.

Depending on your location, municipal landfills and fire stations may also accept waste fluids.

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