What is OBD-II: A standardized system in all cars since 1996 that monitors engine, transmission, and emissions, storing trouble codes when something’s off. Why it matters: Reading codes with a scanner ...

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 ...

Your car’s OBD-II system is like a built-in health monitor, storing trouble codes when something’s wrong. Learning to read these codes helps you decide whether to keep driving or head straight to a ...

The world of car diagnostics has changed a lot over the last 50 years. Back in the '70s and earlier, a mechanic's most valuable diagnostic tools were usually their eyes and ears. You could figure out ...

The OBD acronym stands for on-board diagnostics, a system built into modern vehicles that monitors the performance of the engine and other critical components. An OBD system records diagnostic trouble ...

Whether you're an everyday driver or a pro technician, when your check engine light suddenly comes on the first step is to connect an OBD-II scanner. At Autoweek, we recommend everyone carry an OBD-II ...

️ Editor's note: This product category requires new testing about once a year. We'll update this article with the most recent information when it's available. Modern cars are technological marvels, ...

We may receive a commission on purchases made from links. The OBD acronym stands for on-board diagnostics, a system built into modern vehicles that monitors the performance of the engine and other ...

This article was updated in November 2024 with new products and information. Nothing can ruin a drive like seeing the "check engine" light on your dashboard. For many, the initial reaction might be to ...

Seeing your vehicle's check-engine light come on can throw a wrench in your travel plans. It can also feel a little scary: Does it mean your ride is headed for the scrapyard? Or is there a simple fix?