Modern cars are complex machines, and even simple issues can trigger warning lights. Fortunately, diagnosing many problems is now accessible to anyone with an OBD (On-Board Diagnostics) reader – a tool that can cost less than a fast-food meal. These devices plug into a standard port in most vehicles, allowing you to read and reset error codes, check vehicle identification numbers (VINs) for potential cloning, and even access advanced data during driving. We tested a range of readers to find the best options for DIY mechanics.
Testing Methodology
We focused on readers designed for everyday users, not professional mechanics. Our tests involved wired and Bluetooth devices connected to Apple iPhones, evaluating ease of use, features, and value for money. We connected the readers to a SEAT Ibiza, Fiat Panda, and Volvo XC60 to verify compatibility and code-reading accuracy.
Top Picks: Balancing Price and Performance
Temu Professional OBD2 Diagnostic Scanner Tool (£10.12)
This is the standout budget option. Despite its low price, the Temu reader features a full-color LCD screen and provides live engine data, including battery voltage. It quickly detected and cleared test fault codes. The build quality is basic, with a fragile case and a short cable, but for occasional use, it’s unbeatable.
Carly Universal Scanner (£59.89)
Carly offers a flexible system with universal and marque-specific packages. The Premium Package (e.g., SEAT-specific at £59.89) unlocks advanced features like modifying automatic locking settings. The app is intuitive, making it easier to navigate compared to other Bluetooth readers.
TOPDON Topscan (£69.99)
TOPDON’s new Bluetooth range replaces its popular wired scanners. While lacking the “plug and read” simplicity of the older models, the Topscan provides access to more detailed data and upgradeable features. The app, however, needs improvement – it can be slow and confusing.
OBDEleven (£73.29)
OBDEleven excels with Volkswagen Group, BMW/MINI, Toyota/Lexus, and Ford vehicles. It delivers detailed fault histories and enables customization of features like cornering lamps and locking settings. However, unlocking additional features requires extra payment.
Motopower MP69033 (£19.99)
Previously a Recommended product, the Motopower remains a solid choice, especially at its reduced price. The monochrome screen and one-button VIN checker are convenient, though it’s now pricier than some competitors.
Simply OBDII Readers (£24.89 – £49.99)
Simply’s readers are straightforward to use, with color screens and longer cables for easier access. However, they don’t offer significant advantages over the cheaper Temu model. The basic £24.89 version is slow and limited in functionality.
Why This Matters: The Rise of DIY Auto Diagnostics
The increasing complexity of modern vehicles means more frequent diagnostic checks. OBD readers empower owners to identify issues early, potentially saving on expensive garage visits. The rise of these tools reflects a growing trend toward self-reliance in car maintenance. However, it also raises questions about data security and the potential for unauthorized vehicle modifications.
The Verdict
For basic code reading and resetting, Temu’s scanner is hard to beat. Its low cost makes it an ideal entry point for DIY mechanics. For more advanced features, Carly and TOPDON offer compelling app-based solutions. The choice depends on your budget and the level of detail you need.
