Turn your smartphone into a professional car diagnostic tool with a $15-30 OBD2 adapter and free apps that read engine codes ...

We earn commissions from purchases you make using links in our articles. Learn more. If your car or truck’s check engine light is on, there’s a stumble when accelerating, or if the transmission just ...

An OBD2 (On-Board Diagnostics II) scanner can provide information about the status and health of various vehicular systems.

Modern cars are basically computers on wheels. With so many electrical systems, sensors, and motors, there’s so much that could potentially go wrong. When something does go awry, pinpointing the ...

Gear-obsessed editors choose every product we review. We may earn commission if you buy from a link. Why Trust Us? The check engine light by its nature is vague, just a general indication that ...