On-board diagnostics - Wikipedia
On-board diagnostics (OBD) is a term referring to a vehicle's self-diagnostic and reporting capability. In the United States, this capability is a requirement to comply with federal emissions standards to …
Best OBD2 Scanners for 2026, Tested - Car and Driver
Nov 19, 2025 · Did your vehicle's check-engine light just pop on? An OBD-II scanner can point you in the right direction—and potentially save you a bundle. This article was updated in November 2025 …
What is OBD? What You Need to Know - AutoZone
On-Board Diagnostics (OBD) is a system that monitors a car’s computer system and reports diagnostic trouble codes. Devices like an OBD-II code reader can read diagnostic trouble codes (DTC) that the …
What Is OBDII? History of On-board Diagnostics (OBD) | Geotab
May 6, 2025 · An OBDII is, simply put, the second generation of an OBD or OBD I. The OBD I was initially externally connected to the console of a car, while the OBDII is now integrated within the …
From dongles to diagnostics, here’s all you need to know about …
Apr 25, 2023 · Known as OBD II, that standard was implemented for the 1996 model year and is still in use today. Previous iterations of OBD were retroactively classified OBD I. Virtually every new car …
On-Board Diagnostic II (OBD II) Systems Fact Sheet
Oct 10, 2023 · OBD II systems monitor various aspects of a vehicle’s performance using sensors and diagnostic equipment. These systems constantly collect data from different components, such as the …
What is OBDII? Everything You Need to Know About On-Board …
Dec 26, 2025 · OBDII is a standardized vehicle diagnostic system that monitors engine and emissions performance and reports faults through diagnostic trouble codes. OBD-II, short for On-Board …
OBD2/OBDII: The Ultimate Guide to Onboard Diagnostics
Mar 3, 2025 · Learn about OBD2, how it works, its compatibility, and how to read trouble codes. Discover the benefits of onboard diagnostics (OBDII) for car maintenance and repairs.
What Are OBD-II Codes? A Complete Guide by Kelley Blue Book
OBD-II codes alert you when your car is having issues – everything from airbags to brakes. The most common place to access them is through the OBD-II port under your vehicle’s steering column....
OBD2 Explained - A Simple Intro [2025] – CSS Electronics
OBD2 is your vehicle's built-in self-diagnostic system. It is a standardized protocol that allows extraction of diagnostic trouble codes (DTCs) and real-time data via the OBD2 connector. You've probably …