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In the Philips FD series, the detectors are 10 and 20 inches, respectively.
Aside from fiddling the ignition timing and reminding you to change your oil, the computer module in your vehicle is responsible for running a suite of diagnostic procedures.
It will tell you if something’s amiss with your car. All you’re likely to see is the “service engine” light on your dashboard, or one of several other similarly cryptic indicators.
This latter issue has become more of a concern with the current generation of computer-equipped cars, as their designers have been hanging an increasing number of functions on their indicator lights.
These indicators can be triggered by relatively trivial issues.