Your car can either be your best friend or biggest foe depending on how
well you maintain it. But with the advent of the car ECU (that’s
“engine control unit,” aka the car’s computer), many of the tweaks that
gearheads could perform manually are handled behind the scenes by the
car itself. When’s the last time someone told you they had to adjust
the fuel mixture on their carburetor? The ECU takes care of that for
you, on the fly. Of course, when the Check Engine Light (CEL) begins to
glow on the dash, most drivers panic, and for good reason. The CEL
could be something as minor as a fuel cap that needs to be
tightened--or it might signify that one of your cylinders misfired.
CarMD enables you to take some of the guesswork out of determining
exactly what’s wrong with your ride with the help of its literally
named 2100 Handheld Tester.