A car repair resource site that helps you diagnose vehicle OBD, OBD-II, and OBD2 problems. We have many articles on how to diagnose and repair many check engine light codes.

A PC-based OBD analysis tool converts the OBD-II signals to a serial data format (USB or serial port) readable by PCs or Macs. The software then decodes the received data for visual display.

Choose the section of codes based on the first three characters of the code (e.g. P0171 is on the P01xx or P0100 through P0199 page): If you're unsure where to find code information, we highly …

Nov 19, 2025 · Did your vehicle's check-engine light just pop on? An OBD-II scanner can provide some direction. We tested a handful to find the best for different situations.

The OBD port is an electrical plug that OBD-II scanners, code readers, and other devices can be plugged into to access the OBD-II system. It is also the port that is typically used for state vehicle …

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....

Vehicles 1996 or newer can be scanned by plugging our O’Reilly VeriScan code reader into your OBD-II system – just ask for a free Check Engine light test.

Explore the world of On-Board Diagnostics (OBD) with OBD Guides. Learn about OBD-I, OBD-II, and the latest in vehicle diagnostics and maintenance.

Ever noticed the malfunction indicator light on your dashboard? That is your car telling you there is an issue. If you visit a mechanic, he will use an OBD2 scanner to diagnose the issue. To do so, he will …

Aug 14, 2025 · In short, OBD2, or OBD-II, is a diagnostics system found in today's cars and trucks. It's like the vehicle's health check mechanism, consistently monitoring different parts and systems. When …