When I got my first performance vehicle (a 2000 Subaru Forester STI) the first thing I bought for it was an OBD-II code reader so I could monitor the sensor levels and pull codes in the event anything ...

The second iteration of on-board diagnostics, OBD II, has been required tech on all new cars sold in the U.S. since 1996. That means that anyone who uses or works on cars less than three decades old ...

That's where OBD-II scanners come in, giving enthusiasts and everyday drivers a window into their vehicle's diagnostic systems. If you're chasing down the cause of a check-engine light, ensuring peak ...

Your check engine light can come on a host of reasons, ranging from a loose gas cap to a faulty engine component. If you see a light illuminated on your dashboard, you can use an OBD2 scanner to ...

Cars are more than just oil and steel. Modern models have incorporated electronics and computer chips to help manage and optimize their mechanical components. That means maintaining your car's ...

We may receive a commission on purchases made from links. It's probably happened to everyone at least once. You're driving along enjoying your favorite tunes when suddenly, your car's "check engine" ...

I’ve picked seven of the best Bluetooth-connected scanners that plug into a car’s OBD2 socket and put them against each other ...

This article was updated in November 2025 with new information. You know you’ve earned your DIY stripes when you can stay calm the moment something goes wrong. And with cars, that moment usually ...