Best bidirectional scan tools | Reviewed by a mechanic

Why do you need a bidirectional scan tool? The simple answer is that they make it much faster and easier to diagnose problems with your engine. With a bidirectional scanner, you can run tests with the scan tool itself instead of having to manually check and test components on the vehicle, which goes far beyond the codes and data produced by an ordinary OBD2 code reader.

We’ve picked out the best bidirectional scan tools available and reviewed them for you here. Read through our tips and suggestions to help you pick the right one for your needs.

Best bidirectional scan tools: Comparison chart

Best bidirectional scan tools reviews

Launch X431 V+ Pro Elite Bidirectional Scan Tool

The Launch X431 V+ Pro Elite puts a repair shop in your pocket, with a wide range of professional features that let you go beyond basic diagnostics. Its active/bidirectional control is as broad as its diagnostic power. You can read data and test components from any system in the vehicle with this bidirectional automotive scanner. Once you have the data, it’s easy to record, playback, or print, with large on-board memory and built-in Wi-Fi connectivity.

You’ll get a full array of maintenance and reset functions with the Launch X431 V+ Pro Elite, as well. Its 41+ service functions include standard options like SAS calibration and oil reset along with less common features, such as key programming and injector coding. It also includes ECU coding capabilities, so you can even use it to tune and customize your vehicle.

The Launch X431 V+ Pro Elite may be a bit complex for everyday users. However, for professionals and advanced DIYers, it’s worth the investment, with an intuitive menu system and dealership-level functionality.

Verdict

Launch X431 V+ Pro Elite bidirectional OBD2 scanner is the ideal bidirectional scanner for professional, dealer-level diagnostics and repair functions.

Autel MaxiPRO MP808S Pro Bidirectional Scan Tool

The main advantage of the Autel MaxiPRO MP808S is the number of service functions you get for the price. It’s capable of performing advanced repairs like programming new keys, throttle and transmission adaptation, and calibration functions – more than 30 repair functions in all.

You’ll get the same dealership-level performance on the diagnostic side. It’s not limited to a few systems like other scan tools. In fact, you can both read data and conduct active tests of components in all on-board systems.

The Autel MP808S also offers broad vehicle compatibility. Since it comes with 11 different adapters, it will work with vehicles other OBD2 scanners won’t. The only caveat here is that not all service functions are supported for all vehicles, so you’ll want to verify its compatibility for your car or truck before buying it.

Verdict

With over 30 service functions and all-system diagnosis, the Autel MaxiPRO MP808S bidirectional OBD2 scan tool is one of the most comprehensive bidirectional scan tools on the market today.

Launch X431 Diagun V Bidirectional Scan Tool

The Launch X431 Diagun V is a great mid-range option for those who need professional functionality on a DIYers budget. This bidirectional OBD2 scan tool will perform active tests of all valves and solenoids, along with reading module data and error codes from any system in the vehicle.

Not all vehicles allow coding and adaptation through the OBD2 port. Fortunately, the Launch X431 Diagun V comes with connectors for other diagnostic ports, expanding its advanced features’ compatibility. And those features are robust, including functions like buzz tests and IMMO service.

We also appreciate how easy the X431 Diagun V is to use, especially considering the breadth of its features. The 5.5 inch touchscreen device comes with an Android 7.1 operating system that’s intuitive to navigate. It also allows you to download 3^rd party diagnostic apps, adding to its diagnostic power.

Verdict

Full bidirectional control, along with coding and reset functions, make the Launch X431 Diagun V bidirectional scan tool one of the most powerful scan tools in the mid-range price point.

Launch X431 V Pro 5.0 Elite Bidirectional Scan Tool

The Launch X431 V Pro 5.0 Elite includes all-system diagnostics, active testing for all on-board components, and more than 37 reset and repair features. You can use it to make new keys, code injectors, bleed the ABS, or anything else you can think of related to your vehicle.

Even more impressive, the X431 V Pro 5.0 Elite is lighter and more compact than the V+ Pro Elite, so it’s easier to carry around. The 8 inch touchscreen is very easy to read and navigate. It even includes an 8MP camera on the back, and a 5MP camera on the front of the device, giving you the ability to make a visual assessment of components, and so that you can share the photos with fellow mechanics and the customer if required.

You’re probably wondering – what’s the catch? Well, not too much, other than the fact that the Launch X431 V Pro 5.0 Elite has slightly more limited vehicle compatibility. It won’t work with heavy trucks, for example. The compatibility of its service functions is also more limited compared to the Launch X431 V+ Pro Elite. That’s why we conclude that it is a a better choice for advanced DIYers than professionals.

Verdict

The Launch X431 V Pro 5.0 Elite bidirectional scan tool almost matches the functionality of the V+ Pro Elite at a lower cost, and it is a very impressive device. However, its slightly more limited capabilities may make it a better choice for DIYers than for professional mechanics.

Autel AutoLink AL619 Scan Tool

It’s rare to find active testing offered by any scanner in the $100 or less price range, so that alone makes the Autel AutoLink AL619 worth checking out. This impressive hand-held scanner can also read codes from the ABS and SRS systems and give access to all 10 modes of the OBD2 protocol.

Technically the AutoLink AL619 does not offer full bidirectional control as it only has very limited capabilities. However, we still chose to include it on this list as you can use it to run EVAP leak tests and other component tests supported by OBD2, but it can’t perform active tests on other systems. Certain vehicles also won’t support active testing, so you’ll want to check compatibility before making any decisions.

With that said, the diagnostic compatibility of the Autel AutoLink AL619 is broad, with coverage for more than 80 manufacturers worldwide. If you want a scan tool that’s both great value and easy to use, and even has limited active testing capabilities, this is an excellent option.

Verdict

The low price and wide vehicle compatibility of the Autel AutoLink AL619 diagnostic tool make it one of the the best scan tools for newbie DIYers.

Autel MaxiPRO MP808S-TS Bidirectional Scan Tool

The Autel MaxiPRO MP808S-TS combines the diagnostic and bidirectional power of the MP808S Pro with TPMS functionality. TPMS (Tyre Pressure Monitoring System) is a system that monitors the pressure in the vehicle’s tires and alerts the driver when the pressure is too low. This functionality is quite specialized and not many lower level scanners are equipped with this, and the MaxiPRO MP808S-TS gives you a tool to diagnose and repair nearly any vehicle system, with fast and accurate data you can trust.

From a design standpoint, the touchscreen and design of the Autel MP808S-TS is similar to the MP808S Pro. It’s intuitive for mechanics, though it may be somewhat overwhelming for beginners. Among its many features are in excess of 31 service functions, ECU programming and a special add-on to the TPMS feature, “TPMS Retro-fit”, which allows for the installation of aftermarket TMPS sensors and modules into vehicles without a factory-fitted OEM tire pressure module or sensors.

The only potential drawback of the Autel MaxiPRO MP808S-TS from a professional standpoint is that all vehicle types don’t universally support its bidirectional control. However, it does have wide compatibility for its all-system diagnosis and TPMS features, with support for more than 150 manufacturers from the US, Europe, and Asia.

Verdict

With full TPMS functionality and advanced diagnostic power, the Autel MaxiPRO MP808S-TS bidirectional scanner is a tool suitable for repair professionals.

Autel MaxiSYS MS906 Pro Bidirectional Scan Tool

The 8-core processor used in the Autel MaxiSYS MS906 Pro is up to 50% faster than other scan tools. It also ensures real-time live data readings are as accurate as possible. You can take those data readings from any system in the vehicle, and its bidirectional testing capabilities are equally comprehensive. This is a very powerful device.

The Autel MS906 Pro also has more service functions than most other tools, over 36 in total. You can calibrate a range of sensors, relearn the idle or crankshaft position, and much more. In addition, it even has ECU coding capabilities, so you can use it to tune engines, program new keys, and perform other dealer-level repairs and maintenance tasks.

Like other Autel scanners, the MS906 Pro includes a data manager for storing data and a Wi-Fi connection for updating and printing. It also has wide compatibility, with diagnostic coverage for any OBD2-compliant vehicle. Our only complaint against the Autel MS906 Pro is the price. Not only is it a higher initial investment, but you’ll also have to pay for updates after the first year, as only 1 year of free updates are included.

Verdict

With a faster processor and more service functions than most bidirectional scan tools, the Autel MaxiSYS MS906 Pro bidirectional scan tool is designed with professional mechanics in mind and will be a great addition to any workshop.

Innova 5610 Bidirectional Scan Tool

The Innova 5610 reads data and codes from the 4 major systems (engine, transmission, ABS, and SRS). Along with that, you can read sensor data from the TPMS. Its bidirectional control is limited, allowing you to manually control the Electronic Parking Brake (EPB) system, clutch, fuel pump and a few other components.

It also includes the service functions that are most used by home mechanics. Incredibly helpful is its support for battery tests and reset, which is supported for both hybrid batteries and traditional styles. It can also regenerate the DPF, reset the steering angle, and perform other relearn functions for many vehicles. Keep in mind the support for these features varies and won’t be available for all vehicles.

The design of the Innova 5610 makes it an ideal choice for home mechanics. It’s easy to use, with helpful features like an at-a-glance smog check that everyday drivers will appreciate. You’ll even get repair suggestions tailored to your vehicle through the free RepairSolutions 2 app.

Verdict

The Innova 5610 bidirectional scanner is an ideal choice for DIYers, with a wide range of functions and a user-friendly design, all for a very affordable price.

Foxwell NT510 Elite Bidirectional Scan Tool

The Foxwell NT510 Elite is a great, affordable bidirectional scan tool. It can read codes and data from all the major systems and allows you to take manual control of sensors, actuators, and other electronic components. Since it also includes oil reset, it’s a great way to make repairs and turn off any dash warning light.

Along with this, you’ll get a good array of service functions. You can use it to register a new battery, bleed the brakes after repairs, or make adjustments to the idle speed or throttle body. While it stops short of programming and coding functions, it’s still got a lot of power for the price.

The catch is it’s not compatible with all vehicles. These advanced features are tailored to work on vehicles made by BMW, Mini, or Rolls Royce (although I very much doubt that if you can afford a Rolls Royce, you’re going to be working on your car yourself!). For any other vehicle, the scanner will still work, but it will only perform basic OBD2 functions. Still, it’s a smart buy if you own a car made by one of those manufacturers though.

Verdict

Owners of BMW, Mini, and Rolls Royce vehicles will get amazing bang for their buck with the Foxwell NT510 Elite bidirectional OBD2 scan tool as it is a really capable and affordable tool and we can highly recommend it.

Foxwell NT630 Plus Bidirectional Scan Tool

Another affordable bidirectional scan tool from Foxwell, the Foxwell NT630 Plus is a powerful hand-held scanner, first and foremost. It reads and clears fault codes from 4 vehicle systems, and shows live data from associated sensor modules. Best of all, it will do all of this for most vehicles on the road. You can run OBD2 diagnostics on nearly any car, truck, or SUV, and ABS/SRS codes and data are supported for more than 60 manufacturers.

Where the Foxwell NT630 Plus shines is its advanced diagnosis and repair features for the ABS and SRS systems. It also offers active testing of switches, actuators, and other manual components in these systems.

Along with that, you’ll get helpful maintenance features, like automatic ABS bleeding, that are relatively rare on scan tools at this price point. If you’re looking for an affordable bidirectional scan tool, the Foxwell NT630 Plus is a top option.

Verdict

To diagnose and repair ABS/SRS issues, the Foxwell NT630 Plus bidirectional scan tool gets the job done on a budget.

Recommendation: Top 3 Bidirectional Scan Tools

For professional mechanics, the Launch X431 V+ Pro Elite is one of the best bidirectional automotive scan tools you can buy. Yes, there are more expensive options out there with some really impressive features and specs, but the functionality of those tools are not going to far exceed what this device can do. It has all the functionality that a professional may need, including advanced coding capabilities and full-system active testing.

Home mechanics will want to look for a tool more in the mid-range price point. Both the Autel MaxiPRO MP808S Pro and the Launch X431 Diagun V are excellent options, with a plethora of service functions, all-system diagnosis, and included adapters, so they work with more vehicles. Which one is right for you will depend on your vehicle’s compatibility and which one offers the most features for your car or truck.

Benefits of Bidirectional Scan Tools

• Access more data and information. Many hand-held scan tools stop at engine data. Bidirectional automotive scan tools are more likely to support multi-system or even full-system diagnosis, giving you a complete picture of your engine’s health.
• Faster troubleshooting of engine issues. Taking active control of actuators, valves, and other components lets you identify the specific point of failure causing trouble codes. This is a huge time-saver compared to manually testing.
• Make repairs at home. For DIYers, the range of service functions included in bidirectional automotive scanners will enable you to take charge of your vehicle’s maintenance. You can do more without needing a professional, and that can save you a ton of money in the long run.
• Customize your vehicle. If you want to upgrade vehicle components or tune the engine, many bidirectional scan tools (with ECU coding) will let you do so.

Types of Bidirectional Scan Tools

• Hand-held OBD2 scanners. The most common type of bidirectional scan tool. These devices have an electronic controller with a screen and keypad connected to an OBD2 adapter. They’re easy to use and don’t require charging or outside power.
• Tablet-based diagnostic tools. Similar in design to hand-held scanners, these devices use a full tablet rather than a hand-held tool. This gives them touchscreen navigation as well as a more powerful processor with a larger memory.
• Wireless scanners. These tools have a built-in Wi-Fi or Bluetooth design. They still connect to the vehicle via the OBD2 port but aren’t restricted by a cable, allowing you to use the tool from outside the car once the VCI is plugged in. Wireless support also makes updating the tool and printing data easier.

Top brands of Bidirectional Scan Tools

You’ll see the same brand names coming up over and over in discussions of the best bidirectional scanner – and with good reason. These 3 brands have a reputation for both innovation and quality.

Autel

Sold in more than 50 countries, Autel tools are innovative, emphasizing intelligent automotive diagnosis. With more than 10 years in the industry, they’re a trusted name among repair professionals.

Launch

Founded in 1992, this Chinese producer of advanced diagnostic equipment has been an industry leader for more than 25 years. Their tools are used worldwide and have a reputation for accuracy and efficiency.

Foxwell

Foxwell diagnostic equipment ranges from basic code readers to full professional diagnostic tools. Their devices are user-friendly and priced to be affordable for DIYers.

Price range of Bidirectional Scan Tools

• Under $400. Affordable bidirectional scan tool range, they offer comprehensive vehicle diagnosis. However, their service functions and active testing capability will be more limited. They may only support bidirectional control for specific systems or be compatible with vehicles from a few manufacturers.
• $400-$800. These mid-range tools strike an excellent balance between functionality and value. Their active testing capabilities extend to more systems than the cheaper tools, and they’ll usually include a good range of service functions, though they may be missing professional features like ECU coding or key programming. Hence, these are generally the best choice for DIY mechanics
• $800 and up. Professional mechanics will be looking for tools in this price range. They offer both the most features and the broadest vehicle coverage. Along with that, you can expect to get customization and ECU coding options that facilitate more advanced repairs and car tuning.

Tips and buying guides

When you’re buying a bidirectional OBD2 scanner, its manual control capabilities are just one of the features to look for. Let’s go through the main factors that should play a role in your decision.

Key features

• Vehicle compatibility. This is the first thing you should check. While the OBD2 system is standardized, diagnostic protocols for other systems aren’t. As a result, some scan tools work better with one manufacturer than another. Always verify that the features you need are available for your car or truck before you buy any scan tool.
• Diagnostic capability. Some scan tools will only read engine data. On the other extreme, all-system scan tools can gather data from any module in the vehicle. Generally, the more systems a tool can scan, the more you should expect it to cost.
• Repair functions. Many tools with bidirectional control can also affect the engine in other ways, like manually controlling the EPB (Electronic Parking Brake) calipers or running automatic brake bleeding cycles. These features will mostly be of interest to those planning to repair or maintain vehicles themselves, instead of everyday drivers who only want to learn about issues they may be having.
• Data speed and accuracy. Regardless of what else the tool does, it will only be valuable to you if you can trust the data it provides. This is why we recommend buying from a trusted brand, like the three listed above.

Other considerations

• What kind of tech support does the company offer? If your tool has an issue, strong tech support can save you lots of frustration. Consider how responsive the company is to customer issues and whether they offer repair advice or other helpful services.
• Do you have to pay for updates? Some companies make their scanner updates free for the lifetime of the tool. Others require a subscription or payment after 1 or 2 years. DIYers especially should beware of this as some of these updates can be very expensive. If you don’t update, some of the functionality of your scanner may no longer work.
• Do you have experience with diagnostic equipment? Tools with more functions are aimed at professionals and can be overwhelming for beginners. A more straightforward tool can be a better place to start.

FAQs

❓ What is bidirectional control?

💡 Also called “active testing”, bidirectional control means that the tool can both send and receive information. Many scan tools only receive data but can’t request information or send commands to the engine. A bidirectional automotive scanner can conduct this kind of 2-way conversation with your car or truck.

❓ Is bidirectional control the same as ECU programming?

💡 No. ECU programming is the process of coding or programming the ECU and making changes the parameters or settings on the engine computer. With active testing, you’re taking temporary manual control of a test, actuator, or other components, not making any permanent changes, which is what happens in ECU programming.

❓ How can I check whether a bidirectional scanner is compatible with my vehicle?

💡 The easiest way is to reach out to the manufacturer via an e-mail address. Some companies have a self-serve compatibility checker online, such as the INNOVA compatibility checker, which can be a faster way to get that information.

❓ Do I need to register or update these bidirectional scan tools before I use them?

💡 No. All of these tools are designed to be used right out of the box. However, you may need to register your tool to download any associated apps, like FoxAssist or RepairSolutions2, but you can start diagnosing issues as soon as you receive them.

So initially, the tools should all work as intended and should all contain the latest available software out of the box. As mentioned, with some of them, after a certain period of time, updates may be required in order to continue using certain functions. Depending on the brand, some of these updates are free for the lifetime of the product, and others are only free for a certain period, after which, you will require to pay for further updates. Please always check with the seller of the device you are looking at before purchasing if you are unsure, as some of these updates can be very expensive.

❓ How to update my bidirectional automotive scan tool?

💡 The specific process will differ between manufacturers, so your first step should be to check the manual that came with your tool.

Generally, with wireless scan tools, this should be able to be done from the interface on the device itself over a Wi-Fi connection. However, with wired scanners, you’ll typically need to connect the device to a PC using a USB cable. After you download the update onto the PC from the scanner manufacturer’s website, the device should prompt you to install it.

Final thoughts

Choosing a bidirectional scan tool doesn’t have to be a complicated process. Start by figuring out which features you need, then check which tools offer those for your specific vehicle. Once you see what these bidirectional scanners are capable of, you’ll be glad you decided to add one to your automotive diagnostic arsenal.