What Is a Car Code Reader?

Mark Alliegro  > Tech >  What Is a Car Code Reader?
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A car code reader is a small tool that can read fault codes from your vehicle’s computer. It is useful for troubleshooting issues and can also save you money by eliminating the need to pay a mechanic for diagnostic services.

A simple code reader will simply plug into the OBD-II port under the steering wheel. This is the little port that looks like a trapezoid with 16 pins. Most vehicles manufactured since 1996 will have this. The device can then read error codes from the car’s system and display them on a screen. The reader can also clear these codes and reset readiness monitors.

Generally, you will find several different types of readers available on the market. Some are very cheap and may be found for sale in parts stores or at garages. Others are more expensive, but have more features.

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This is an inexpensive model from Draper that can turn off your engine light and display the code for you on a screen. It can’t show live data or have a freeze frame, but it does include the option to check the VIN and is compatible with iOS and Android smartphones. It has a small screen and annoying beeping for every button press, but you can disable this in the system set-up menu.

A more advanced reader, such as this one from TOPDON, can be used to diagnose and fix a wide variety of problems on most vehicles. This model includes key programming capabilities and supports 96 vehicle manufacturers. It has a larger display and can perform more functions than the entry-level models, including reading out the error code in plain English. It can also perform key programming, reset the airbag and ABS brake codes, and read engine temperature.

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