A Comprehensive Review of the Topdon Topscan OBD2

If you’re into DIY vehicle diagnostics, the rise of Bluetooth OBD2 scan tools is a game changer. They offer a sleek alternative to bulky, traditional scanners, allowing users to connect directly to their vehicles using a smartphone app. In this review, we’ll dive deep into the Topdon Topscan Bluetooth OBD2 Scanner to evaluate its performance, features, and practicality.

Watch the full video HERE.

The Topdon Topscan scanner is a well-designed device with a sleek and compact form factor. It features a USB-C port for firmware updates, which ensures the device stays compatible with new vehicle software. The packaging includes a QR code for downloading the app on iOS, while Android users might face a slightly more convoluted setup.

The build quality feels solid, and its lightweight design makes it easy to handle. The scanner supports vehicles manufactured after 1996, covering a broad range of makes and models—from American to European and Asian cars.

To connect, the process is straightforward:

1. Locate the OBD2 port (typically in the driver’s footwell area).
2. Plug in the Topdon unit, which signals a connection with a beep and a red LED indicator.
3. Turn on the vehicle’s ignition (engine off) to start diagnostics.

The app, TopGuru, requires an account setup. While this is a minor inconvenience, it’s manageable. Once connected, the app allows access to a wide array of diagnostic functions.

The Topdon scanner offers:

• Code Reading and Clearing: It accurately identifies diagnostic trouble codes (DTCs) and clears them after issues are resolved. However, it only displays pending and current codes—not permanent codes, which are crucial for emissions tests.
• System Scanning: The device performs full system scans, covering modules like engine, transmission, airbags, and ABS. It even generates a report with vehicle mileage automatically detected.
• Actuation Tests: This is the standout feature, allowing users to send commands to components like windows, fans, or solenoids. These bi-directional tests are invaluable for pinpointing issues without disassembling parts of the vehicle.

The scanner supports up to eight hot functions, such as:

• Throttle adaptation
• Oil maintenance reset
• Electronic parking brake control
• Airbag system checks

However, functionality depends on the specific vehicle model. For example, diesel particulate filter (DPF) functions won’t apply to a Toyota Prius.

The scanner provides readiness data for emissions tests, but the representation can be misleading. It uses vague icons rather than detailed numerical data, which may confuse users.

The app offers access to TSBs, which can provide repair insights for common issues. Unfortunately, this feature frequently experienced connectivity issues and app crashes during testing.

After the first year, users need to pay $49 annually for continued access to all functions. While this might seem like a downside, the advanced features—like bi-directional control—justify the recurring fee for serious DIYers.

1. Actuation Tests: The ability to command components directly (e.g., window motors) is a major advantage.
2. Wide Compatibility: Supports most vehicles post-1996, across diverse makes and models.
3. Affordability: At around $69, it’s an economical option compared to professional-grade tools.
4. Portability: Its compact design and Bluetooth connectivity eliminate the need for bulky equipment.

1. Inspection Monitor Accuracy: The readiness data presentation could be more intuitive and accurate.
2. TSB Reliability: Persistent app crashes made the TSB feature unreliable.
3. Permanent Codes Missing: Lacks the ability to display permanent codes, a critical omission for emissions-related diagnostics.
4. Subscription Cost: The $49 yearly fee might deter casual users, though serious DIYers will likely find value in the advanced features.

This scanner is ideal for:

• DIY enthusiasts who need advanced diagnostic tools.
• Users looking for affordable bi-directional capabilities.
• Those comfortable with annual subscriptions for updates and advanced functions.