Diagnostics 48 wants to undertake. The right aftermarket tool can substantially reduce the number of jobs being turned away or subcontracted. Nevertheless, it should not automatically be viewed as a complete replacement for every manufacturer’s diagnostic system. When OEM tools become worthwhile OEM tools offer depth rather than breadth. Systems such as BMW ISTA, Mercedes-Benz XENTRY, VAG ODIS, Ford FDRS and Stellantis WiTECH are developed for their respective manufacturer networks. They provide access to manufacturerspecific procedures, guided diagnostics, software updates, online coding, programming, and other functions that a multi-brand platform may not fully support. For a general workshop that sees a particular marque occasionally, investing in its OEM system may not be commercially justified. However, the calculation changes when a workshop specialises in a brand or regularly sends profitable work elsewhere because their existing tool is missing the required functionality. The purchase price of the interface is only part of the decision. Workshops must also consider software subscriptions, account registration, security requirements, compatible laptops, updates, training and the time required to keep the system working correctly. An OEM tool can add valuable capability, but only when the workshop has the vehicle volume, technician knowledge, and support needed to use it effectively. Where pass-thru fits Pass-thru provides a useful middle ground between multi-make diagnostics and purchasing a genuine interface for every manufacturer. An approved J2534 interface can allow a workshop to use certain manufacturer software without having to invest in the OEM hardware package for one brand. This can be a costeffective way to handle occasional manufacturer-level work or to test whether there is sufficient demand to justify investing in a dedicated system. However, pass-thru capability varies between manufacturers. Access to diagnostics, coding, and programming depends on the individual OEM platform, not the interface alone. Pass-thru can work particularly well for occasional diagnostics, but regular programming may be slower or less straightforward than using the manufacturer’s genuine VCI. If a workshop frequently programs vehicles from one brand, the genuine interface will often provide a more efficient and reliable long-term solution. Building the right diagnostic set-up For many workshops, the most realistic answer is a combination: O A professional aftermarket tool for everyday multi-brand work. O Selected OEM systems for the manufacturers the workshop sees most frequently. O Pass-thru access for occasional dealer-level requirements. O Specialist equipment for tasks such as oscilloscope testing, battery diagnostics, ADAS calibration or key programming. This does not mean every garage needs to buy multiple dealer tools immediately, as the investment should follow the work. Workshops should look at which vehicles they see most often, which jobs they currently outsource, and where diagnostic limitations cost them time or revenue. From there, they can add capability in a measured way, starting with the areas that offer the clearest return. Ultimately, the aim is not to own the most tools. It is to have the right combination of equipment, software, technical support and training to diagnose vehicles accurately and complete more work successfully. One tool may provide an excellent foundation. Increasingly, however, the most capable independent workshops are building a diagnostic strategy rather than relying on a single platform. www.maverickdiagnostics.com There is no universal “best” aftermarket tool
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