Introduction:

Did you know your car is equipped with an On-Board Diagnostics (OBD) system? The OBDII system, introduced in 1996, relies primarily on a series of sensors inside the vehicle that regulate various functions. OBDII codes (or fault codes) can accurately pinpoint specific issues within your vehicle—ranging from the transmission to the ignition system, brakes, and airbags.

An OBDII code reader is an electronic device that plugs into your vehicle's OBDII port, typically located beneath the steering column. Essentially, it is a simplified version of a scanner, as it doesn’t perform the more complex functions a scanner can offer. A suitable code reader can help you access vehicle information, making it easier to properly diagnose issues.

Understanding OBDII Tools: Code Readers vs. Diagnostic Scanners

There are two tools that can help you diagnose your vehicle’s OBDII codes: the code reader and the diagnostic scan tool.

An OBDII code reader can read, display, and even clear a vehicle’s Diagnostic Trouble Codes (DTC), as well as reset the Check Engine light. For car owners who only need these basic functions, it’s a convenient tool.

On the other hand, a diagnostic scanner not only reads the fault codes but also provides troubleshooting information and tips for diagnosing issues correctly. The diagnostic scan tool can read pending, generic, and manufacturer-specific fault codes. Some high-end models can even record and replay live data and graphical data, along with accessing specific Parameter IDs.

Things to Keep in Mind When Using an OBDII Scan Tool

• Make sure to plug the OBD scanner into the female OBDII port located under your vehicle's steering column.

• Turn the ignition to the halfway point, and not all the way through to start the motor.

Choosing the Best OBDII Scan Tool

Selecting the right OBDII scan tool largely depends on the level of complexity you require from the tool.

There’s a significant difference between basic code readers and feature-rich scan tools: scan tools can access manufacturer-specific enhanced OEM (Original Equipment Manufacturer) codes. These scan tools don’t use the standard OBDII protocol to communicate with car modules. Instead, they use manufacturer-customized protocols, allowing them to connect to all modules within the car, not just emission-related ones. They can also retrieve fault codes unrelated to emissions from the engine and transmission.

If you only need to read triggered OBDII codes, a simple handheld scan tool will suffice. However, for more advanced professional use, you’ll need a software-based diagnostic tool that connects to your vehicle and has higher communication capabilities.

Best OBDII Code Reader for Beginners

The UDIAG CR800 OBDII car code reader scanner is an excellent entry-level scan tool. It’s compatible with multiple car manufacturers and displays collected readings in graphical data format, offering clear and easy-to-read information. It’s a fantastic tool for those who want to understand the OBD codes triggered by their vehicle and have never used diagnostic tools before. Most importantly, it costs less than $40.

Conclusion

In summary, if you want to properly diagnose your vehicle at home, you need an OBD code reader to assist with accurate diagnostics. Choosing the right scan tool can help you identify vehicle issues and perform correct maintenance, extending the life of your car. If you’re unfamiliar with OBDII codes, you can contact a technician in your area or visit a nearby service center.