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An illuminated check engine light is a familiar scenario for any vehicle owner. The uncertainty about the cause and potential repair costs can be stressful. An OBD2 diagnostic tool offers a direct solution by allowing you to read your vehicle's fault memory yourself. However, the market offers a wide range of devices—from a simple fault code reader to a professional workshop diagnostic tool.
This guide is designed to give you clear direction. We will introduce different types of devices and explain the crucial functions to help you find the right tool for your needs and your vehicle.
The choice of the right device depends on your technical expertise and intended use. Here are three key criteria to help you make your decision.
The range of functions is the most important distinguishing feature. Basic devices focus on fundamental OBD2 functions, which primarily concern the engine control unit. They allow you to read and clear fault codes (often referred to as reading and clearing the fault memory) and reset the check engine light.
More advanced models offer diagnostics for all systems of the vehicle, including ABS, airbag (SRS), transmission, and air conditioning. For ambitious DIY mechanics and workshops, special functions are also relevant:
Modern vehicles use various communication protocols. Ensure that the diagnostic tool is compatible with your vehicle model and year of manufacture. Most devices cover vehicles built according to EOBD/OBD2 standards (petrol cars from 2001, diesel cars from 2004 in the EU). Some newer vehicles, especially from GM, require support for the CAN-FD protocol. For vehicles from the FCA group (Fiat, Chrysler, Alfa Romeo), special access (SGW bypass) is often required. Always check the manufacturer's vehicle list before purchasing.
Handling plays a major role in daily workshop life. There are essentially three main designs:
Based on the criteria mentioned, we have compiled a selection of devices that cover different areas of application.
What sets it apart The VDIAGTOOL VD10 is a straightforward, wired fault code reader. It focuses on the core functions of the OBD2 standard: reading and clearing engine system fault codes, viewing live data, and checking the I/M readiness status for emissions testing. Operation is done directly on the device; no app or pairing is required.
Pros
Who is it for? This device is ideal for private car owners and beginners looking for a quick and easy way to determine the cause of an illuminated check engine light and fix basic faults themselves.
What sets it apart The KINGBOLEN Ediag Elite is a modern app-based OBD2 scanner that offers a remarkable range of functions. It connects via Bluetooth to your smartphone (Android & iOS) and unlocks features through the EDIAG app that are usually reserved for more expensive devices. These include all-system diagnostics, over 15 service reset functions, and even bi-directional control for active tests. According to the manufacturer, updates for these functions are free for life.
Pros
Who is it for? The Ediag Elite is aimed at advanced home mechanics and DIY enthusiasts who want deeper insights into their vehicle, perform maintenance tasks themselves, and run active component tests without having to invest in an expensive professional workshop tool.
What sets it apart The Autel MaxiCheck MX808S is a powerful tablet-based diagnostic system running on Android 11. It offers OE-level diagnostics for all vehicle systems and comprehensive coverage of over 10,000 vehicle models. With more than 38 service functions and full bi-directional control, it is a versatile tool for complex diagnostic and maintenance tasks. The AutoVIN function automatically identifies many vehicles, speeding up the diagnostic process.
Pros
Who is it for? The MX808S is an excellent choice for small to medium-sized workshops, experienced technicians, and very ambitious mechanics who need a reliable and fast professional automotive diagnostic tool that covers a wide range of vehicles and functions.
The devices presented here cover a broad spectrum. However, if you are looking for more specific tools or other accessories for your garage, you can find a larger selection in our Automotive Tools category.
1. What is the difference between a basic OBD2 scanner and a car diagnostic tool for all systems? A basic OBD2 scanner (also called a fault code reader) communicates exclusively with the engine control unit according to the legally mandated OBD2 standard. It can read and clear engine-related fault codes. A diagnostic tool that can scan all systems also accesses other control units such as ABS, airbag (SRS), transmission, air conditioning, and on-board electronics, thus providing a much deeper and more comprehensive vehicle diagnosis.
2. Can I reset the oil service with an OBD2 diagnostic tool? That depends on the device. Basic code readers generally do not offer this function. Advanced diagnostic tools like the KINGBOLEN Ediag Elite or the Autel MX808S have an integrated Service Reset Tool function that allows you to reset oil change intervals, electronic parking brakes (EPB), and other maintenance indicators.