![]() These systems are primarily controlled by a single computer: the powertrain control module (PCM). The reason is your car’s computer system. ![]() From timing to tire pressure, you had to keep an eye on every aspect of your vehicle, and it was routine for mechanics to give your car a “tune-up” along with your oil change.Įver wonder why that isn’t necessary anymore? Not too long ago, all of our cars’ systems were manual.
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