Wsiiroon SR850: Professional OBD2 car scan tool review

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Important Notice: The Wsiiroon SR850 OBD2 Scanner is currently unavailable. We highly recommend the Foxwell NT301 as an excellent replacement with the same functions. Read the Honest Review of NT301 NOW before buying.

Vehicle diagnosis is complicated enough to warrant the invention of helpful tools such as the Wsiiroon SR850 professional OBDII scanner.

This full-featured professional vehicle diagnostic kit comes with a color screen, a rugged yet ergonomic build, and support for all OBDII protocols known today.

While some would argue that getting free software updates for life is this OBDII scanner’s best feature, it is hard to downplay its sheer compatibility with a wide range of vehicles and its ease of use.

This review of the Wsiiroon SR850 helps you decide whether this OBD2 scanner is suitable for your needs
If you are wondering what scan tool to buy, this article will help you determine whether the Wsiiroon SR850 is it

Detailed review of Wsiiroon SR850

Reads and defines engine fault codes

You can use the Wsiiroon SR850 professional OBDII scanner to read fault codes and DTCs and clear them. Thanks to its built-in DTC lookup library, which contains over 3,000 generic code definitions, you can also learn what specific codes mean. This makes it a lot easier to quickly and accurately diagnose and solve vehicle issues.

Performs a comprehensive range of tests

The Wsiiroon SR850 professional OBDII scanner supports all OBDII protocols, including CAN, ISO9141, KWP2000, J1850 PWM, and J1850 VPW. It supports both generic (P0, P2, P3, and U0) and manufacturer-specific (P1, P3, and U1) code requests.

The scanner is also capable of showing more technical diagnostic information. It can read and display live PCM data streams and perform O2 Sensor and Evaporative Control System Tests. It can measure Freeze frame data, such as the vehicle’s current speed, engine coolant temperature, and airflow in real-time.

All the collected data is neatly displayed in both text and graph form for quicker analysis.

Displays vehicle information

In addition to displaying a wide range of vehicle diagnostics data, you can use the Wsiiroon professional OBDII scanner to view vehicle information.

The details displayed in this mode include the vehicle’s identification number (VIN), its calibration ID (CID), and its Calibration Verification Number (CVN).

Resets monitors and turns off MIL

A more basic but useful function of the Wsiiroon SR850 professional OBDII scanner is its ability to turn off MIL (check engine lights, for instance) and reset monitors.

This makes it easier to understand the cause behind various warning symbols and is a good fix for malfunctioning indicator lights.

2.8″ LCD color display

Every bit of information is displayed on a crisp LCD color screen which measures 2.8″ diagonally, which is plenty of screens to view various diagnostic data and information in great detail.

The addition of a color screen makes this scanner easier on the eye and great for professional use. It is enough to make up for its lack of mobile connectivity, which is a key feature in several models today.

The interface is slick yet easy to navigate and very attractively laid out. The Wsiiroon SR850 professional OBDII scanner is quite easy to use, even for beginners.

Audio and LED indicators display trouble code status

Three LED indicators and live audio feedback allow you to find out the status of your vehicle’s various components. Different colors represent different statuses, while audio feedback lets you know which components need repair or


If nothing else, this feature makes the Wsiiroon SR850 professional OBDII scanner a more useful tool, especially since it guides the user in the right direction when solving trouble codes.

Internet upgradable

The Wsiiroon SR850 professional OBDII scanner comes with very robust software that is regularly updated at no extra cost. Constant software upgrades help in bug detection and removal, keep the DTC database up to date, and increase the scanner’s capabilities by expanding its operational parameters.

You can hook it up to your PC using the provided cable when you want to print out some information or update the software.

When pressed repeatedly once connected to a PC (supports Windows XP to Windows 10), the screen displays the scanner’s technical support website. Here, you can download and install the software update with one click. On-screen instructions make it impossible to get confused or overwhelmed by the process.

High-quality build

Excellent software demands excellent hardware, which is why one of the Wsiiroon SR850 professional OBDII scanner’s best features is its excellent build quality. A compact design, a resilient anti-shock case, and a textured grip enhance the scanner’s ergonomics and make it quite resistant to damage.

Furthermore, its outer case is dust-resistant and capable of surviving in less than ideal environments.

The ergonomic build makes it very easy to handle with one hand despite its fairly large surface area. Also, it is quite light, so you won’t get tired of carrying it around when continuously running tests.


  • It provides a convenient DTC lookup.
  • It supports multiple languages.
  • The build quality increases ergonomics and durability.
  • There’s no secondary app required.
  • It supports all known OBDII protocols.
  • It offers free software updates for life.


  • It’s not suitable for diesel engines, 24V heavy-duty vehicles, hybrid and electric vehicles.
  • The DTC definition manual is translated from Korean and, as such, has a few typographical errors here and there.

Who is it for?

The Wsiiroon SR850 professional OBDII scanner is easy to master even for non-professional users. However, its range of features makes it a device best used when in the hands of professionals.

The bottom line

At any price point below 100USD, it has always been difficult to get all the features you need in an OBDII scanner plus a solid build quality. The Wsiiroon professional OBDII scanner has shown that this is no longer the case.

It packs a lot of functionality for such a low-priced device. While the color screen, rugged build, and ergonomic design are the highlights of its hardware, it is an easy-to-use software that is constantly updated for free makes this scanner an ideal long-term companion.

Professionals will enjoy the full range of features offered by the Wsiiroon SR850 professional OBDII scanner. But, it is amateurs and car owners who will really appreciate how easy it makes the entire process of car diagnosis.

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