Best ELM327 Adapters Review 2021

Today’s vehicles arrive packed with technology and premium features, but the downside to this is that taking your car in even to get a small issue such as a brake light checked can be an expensive treat.

However, thanks to OBD (Onboard Diagnostics) scanners, it is now possible to diagnose small and certain big issues right in the comfort of your home. But when shopping for the best OBD2 scanner, you may have come across the term ELM327.

So, what exactly is ELM327, how does it work and most importantly what are its supported protocols? If you’re looking to answers to these questions, you’ve reached the right place, because this article will provide the best information to ease your buying decision.

What does ELM327 Mean?

Brought to you by ELM Electronics, ELM327 is basically a programmed microcontroller that is engineered to translate the OBD interface found in most vehicles. This company has been producing ELM27 chips since 2005, and it has been integrated ever since in some of the best OBD devices in the market.

To explain briefly, OBDII scanners can be embedded with a wide range of chipsets, but ELM327 is the most common owing to several reasons, most notably because it supports a broad range of protocols.

Speaking of which, ELM327 supports an extensive list of SAE and ISO protocols including SAE J1850 PWM (41.6 kbit/s), ISO 9141-2 (5 baud init, 10.4 kbit/s), ISO 15765-4 CAN (29 bit ID, 500 kbit/s), ISO 15765-4 CAN (11 bit ID, 250 kbit/s), SAE J1939 (500kbit/s).  

How does ELM327 Work?

Even though ELM327 OBDII scanners are designed to help you diagnose issues with your vehicle, you will probably need additional software or hardware. These devices serve as a bridge between the onboard computer of your vehicle and your handheld devices such as computers, smartphones and tablets and via wired USB, WiFi or Bluetooth.

If you’re wondering which type of device connectivity option is right for you, it varies but here’s a quick breakdown:

  • Wired USB connections – this the most widely compatible option, and ELM327 devices that support it are generally inexpensive due to the lack of wireless radio. Adding to this, they provide a solid connection, but on the downside, you do have a cable that can get on the way.
  • WiFi – just as the name would suggest, these devices connected wirelessly, but as are susceptible to dropped connections.
  • Bluetooth – Bluetooth ELM327 scanners also connect wirelessly with your device, but just like WiFi may incur dropped connections. Adding to this, this range of Bluetooth enabled ELM327 devices are readily available but may be incompatible with some devices such as iPhones.

One thing worth noting when you’re shopping for the best Elm 327 interface is that since Elm Electronics did not copy-protect the v1.0 of the ELM327 microcontroller code, the market is flourished with clones and pirates.

But don’t break a sweat just yet, because after diligently researching this space, we’ve narrowed down on 7 best Elm327 adapters that you can trust will render accurate information about your vehicle.

Best ELM327 Adapters Comparison Chart

Let’s have a look at the best ELM327 adapters comparison chart

<br class=Mestart ELM327 Mini" data-loading="lazy" data-src="">
Mestart ELM327 Mini
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<br class=FOXWELL FW601 Elm327" data-loading="lazy" data-src="">
FOXWELL FW601 Elm327
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Vgate iCar Pro
Vgate iCar Pro
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Our Rating
4.14.1 / 5
3.83.8 / 5
4.44.4 / 5
PriceMestart ELM327 Mini priceFOXWELL FW601 Elm327 priceVgate iCar Pro price
Product Dimensions1.9" x 1" x 1.3"4.5" x 3.6" x 1.2"2.6" x 2.6" x 1.5"
Item Weight0.64oz2.4oz1.44oz
Turning off CEL
Freeze Frame --
Live Data
Reading ABS/SRS------
O2 Sensors --
Compatible AppTorque ProTorque Pro DashCommand
best ELM327 adapter
Brought to you by ELM Electronics, ELM327 is basically a programmed microcontroller that is engineered to translate the OBD interface found in most vehicles.

Best ELM327 Adapter

OHP Forscan ELM327 OBD2 WiFi Adapter – Editor’s Pick

OHP Forscan ELM327 OBD2 WiFi Adapter
4.14.1 / 5
The OHP WiFi ELM327 Forscan OBD2 Adapter is in a league of its own, most notably due to its rich set of features included both Android and iOS support.

To kick things off, this OBDII ELM327 scanning tool can both read and troubleshoot fault codes (DTC), reset oil and most other electronic modules including ABS, airbag, instrument cluster and much more.

Moving further, the OHP WiFi ELM327 hardware device when connected with the Forscan ELM327 hardware renders allows you to apply several different modifications such as heated steering wheel, tire size correction, global windows, and Bambi mode.


  • Works on vehicles 1996 and newer
  • Read and troubleshoot fault codes (DTC)
  • Works best with Forscan software
  • Compatible with Android and iOS devices
  • Ability to apply Forscan mods


  • May get a little warm at times
  • May lose connection when streaming data


best elm327 scanner
OHP WiFi ELM327 is a must have for Ford and Mazda owners.


In terms of coverage, the OHP WiFi ELM327 car diagnostic scanners can be used with all 1996 and newer vehicles sold in the USA including top brands such as Mazda and Ford. Adding to this, it offers solid wireless WiFi connectivity – better than Bluetooth and USB, and supports all OBDII software such as Torque and DashCommand.

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Vgate iCar Pro Bluetooth 4.0 (BLE) ELM327 Adapter

Vgate iCar Pro
Vgate iCar Pro Bluetooth 4.0 (BLE) ELM327 Adapter
4.34.3 / 5
For an ELM327 adapter that connects seamlessly and wirelessly with your vehicle’s OBDII port, and comes with an extensive list of features, look no further than the Vgate iCar Pro device.

It is available in a choice of three different variants – iOS iPhone iPad/Android, Torque Android and iOS iPhone iPad/Android, so regardless of what device you have it will work for you.

In terms of performance, the Vgate iCar Pro device doesn’t disappoint with its plethora of functions including its ability to check and diagnose a wide range of codes. Adding to this, it boasts a compact footprint and connects using Bluetooth 4.0 technology with the most leading app including Torque Pro, DashCommand, and OBD Auto Doctor.

elm 327 interface
Connect to an obd2 apps and get easy diagnostics.

It can also read and delete fault codes, turn off MIL (Check Engine Light), and read ECU data (fuel system status, engine ROM, etc.) in real time. Some of these readouts help you prepare for your vehicle’s emissions test, so you pass on the first go.

But what makes it unique its auto-sleep/auto-wake function, which minimizes power consumption in an effort to preserve battery life. And the icing on the cake is its 2 year warranty, which protects you against any manufacturer defects.


  • Available in three different models
  • 2 year warranty
  • Covers all OBDII vehicles
  • Supports all OBDII protocols
  • Connects with the latest Bluetooth 4.0 technology


  • May not work with older versions of iOS
  • A bit expensive but works like a charm


When it comes to protocol support, the Vgate iCar Pro Elm327 adapter leads the pack with its compatibility with all OBD2 communication protocols, and all OBD2 empowered vehicles such as those sold in the USA of 1996 model year and newer.

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Mestart OBD2 ELM327 Bluetooth Scanner

ELM327 Mini Interface
Mestart OBD2 ELM327 Bluetooth Scanner
4.14.1 / 5
The Mestart OBDII OBD2 scan tool tops this list of best ELM327 hardware devices for one or more reasons.

First, this tool can be used with all gasoline-powered vehicles sold in the USA after 1998, and European gasoline cars of the model year 2001 and newer.

It also works with leading vehicle brands including Ford, GM, Honda, Cadillac, Audi and Bentley, making it an ideal choice to diagnose issues from different model vehicles. Next, it offers excellent wireless connectivity via the latest Bluetooth technology, so you can say goodbye to using any annoying batteries, cables or switches.

With regards to connectivity range, this ELM327 Mini Interface connects with the OBDII component of your vehicle from up to an impressive 10 meters away, which is slightly more than similar models in its segment.

ELM327 Mini Interface
This connects with the OBDII wirelessly.

But that’s just the beginning of its list of premium features, the ELM327 mini interface Mestart OBDII hardware Bluetooth device can be connected with Windows PC’s and laptops, Android devices, and even Symbian devices. Further, it works well with myriad different apps such as Torque Lite (free), Torque Pro and OBD Car Doctor (free).

And if you’re wondering what exactly can it do when connected with a compatible app, the short answer is a whole lot! To name a few functions, they include displaying sensor data for coolant temperature, calculated load value, engine speed, fuel pressure, and absolute throttle position.


  • OBDII compliant and with several protocols
  • Works with USA vehicles of 1998 model year and newer
  • Works with Windows, Android and Symbian devices
  • Can be mated with several third-party apps
  • Latest Bluetooth wireless connectivity


  • Works better with paid apps
  • Phone or connected device may have to be rebooted at times


With regards to protocols, the Mestart OBDII OBD2 ELM327 scan tool is OBDII compliant, hence it supports almost all OBDII protocols including SO9141-2(5 baud unit, 10. 4Kbaud), ISO14230-4 KWP (5 baud unit, 10. 4 Baud) and ISO14230-4 KWP (fast unit, 10. 4 Baud).

In terms of usability, the Mestart Mini interface ELM327 hardware device connects easily with your vehicle’s OBDII port, and then a Bluetooth enabled compatible device. And in case you have trouble with the installation, use the guide in the package to set up the device.

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Foseal OBD2 ELM327 Bluetooth Scan Tool

Foseal ELM327
Foseal OBD2 ELM327 Bluetooth Scanner
44 / 5
For a top-notch WiFi ELM327 hardware device, the Foseal WiFi is not to be overlooked, and here’s why!

For starters, this wireless OBDII scanner can be used with both Android and iOS devices, and help you diagnose and clear a wide range of trouble codes including check engine light, and both generic and vehicle manufacturer codes.

Speaking of which, when connected properly, this smart OBDII scanning tool can display real-time sensory data such as short term fuel trim, intake manifold pressure, oxygen sensor, timing lights and absolute throttle position among others.

Tipping the scales at just 0.64 ounces and measuring 3.5 x 1.8 x 1 inch, the Foseal OBDII ELM327 WiFi scanning device is easy to fit into your pocket and carry around on the go.


  • Works on all vehicles newer than 1996
  • Compatible with Android and iOS devices
  • Connects via WiFi with third party apps
  • Displays a long list of sensory data
  • Backed by 18-month warranty


  • Doesn’t work on cars with 24V voltage
  • Doesn’t work on 1996 F350 7.3 diesel, 2012 Ford Fusion, and 2014 BRZ
  • Adapter is a bit longer than other similar models


All in all, the Foseal ELM327 device works well on all 1996 and newer model vehicles sold in the USA, so no matter the brand or the device you’re using, it will work for you. It can be connected with your vehicle’s OBDII port and several different paid and free third part ELM327 apps such as inCarDoc for iOS devices and Torque Pro for Android.

Last but not least, it supports an extensive list of OBDII protocols that includes SAE J1850 PWM(41.6Kbaud), ISO15765-4 CAN(11bit ID,500) and SAE J1939 CAN(29bit ID,250, etc. To top things off, the Foseal OBDII wireless car diagnostic tool is backed by an 18-month warranty against any manufacturer defects.

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FOXWELL FW601 Elm327 OBD2 Wifi Adapter

FOXWELL FW601 Elm327 OBD2 Wifi Adapter
4.24.2 / 5
The scanner works connects wirelessly to your reading device, there are no pesky wires to deal with.

Foxwell ELM327 can read and clear several error codes in your vehicle including Check Engine Light. It can even check the monitors of your vehicle, display its information and display sensory data among other metrics.

With regards to sensory data, the FOXWELL ELM327 scanner can calculate load value, check coolant temperature, fuel system status, air flow rate, fuel pressure, and even oxygen sensor voltages among others.  

The FOXWELL FW601 Elm327 Obd2 Scanner is easy to use by simply downloading the app on your device, connecting the scanner to your vehicle’s OBDII port and turning it on, and then linking it with your device.


  • Works with leading brand vehicles
  • Compatible with all OBDII protocols
  • Can check sensory information
  • Supports Android and iOS devices
  • WiFi connectivity so no wires in your way


  • Cannot use Bluetooth apps at the same time
  • Using all its features can be overwhelming


The FOXWELL FW601 Elm327 Obd2 Scanner is compatible with both Android and iOS devices. Moreover, this ELM327 hardware offers comprehensive support for vehicles newer than 2000 and all OOBDII protocols such as CAN, KWP2000 and ISO9141-2.

elm327 hardware
Best elm327 wifi hardware.

Even though the FOXWELL FW601 Elm327 Obd2 Scanner is compatible with a wide range of OBDII apps, it works best with OBD Auto Doctor, DashCommand for iOS devices and Torque Pro, Hob Drive for Android devices.

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Gemwon ELM327 OBDII Wifi Adapter

Gemwon ELM327 OBD2 Wifi Adapter
44 / 5
What’s impressive is that it can be connected from up 50 feet away, giving you more space to perform diagnostic tests.

Adding to this, this OBDII ELM327 scanner can be connected with both Android and Apple mobile devices via the latest 802.11a/b/g WiFi.

When connected properly with the right app, device, and OBDII port, the GEMWON ELM327 OBDII scanning tool can display current sensor data such as calculated load value, coolant temperature, long term fuel trim, and oxygen sensor voltages. It is backed by an 18-month manufacturer warranty, so you can rest assured it will serve you well for many years to come.


  • Supports a long list of OBDII protocols
  • Can be connected with iOS and Android devices
  • Compatible with leading OBDII apps
  • Supports all OBDII compliant vehicles
  • Can be used wirelessly from over 50 ft away


  • The device feels a bit fragile
  • May drain your battery more than other devices


The GEMWON ELM327 vehicle diagnostics scanner is a step above the competition, owing mostly to its multi-OBDII protocol support including SAE J1850 PWM(41.6Kbaud), ISO15765-4 CAN(11bit ID,500 Kbaud) and ISO15765-4 CAN(11bit ID,250 Kbaud).

The GEMWON ELM327 OBDII vehicle scanner when connected with a compatible app such as DashCommand or Torque Pro can read and diagnose generic as well as manufacturer-specific trouble codes in their massive 3000 generic code database for any 12v and OBD II compliant vehicles including Mercedes Benz and Subaru.

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Vgate WiFi iCar2 OBDii Elm327 Code Reader for iOS iPhone iPad Android PC

Vgate Wifi ELM327 Wifi
Vgate WiFi iCar2 OBDII Elm327 Code Reader for iOS iPhone iPad Android PC
4.14.1 / 5
Small size, compact structure. Plug and never unplug .Easy to install in your car OBD2 port. High reliable WiFi connection. Super low power consumption.

The Vgate iCar2 ELM327 OBDII vehicle scanning tool can read several different types of engine data in real time such as calculated load value, intake manifold pressure, oxygen sensor voltages, intake air pressure and absolute throttle position.

To add to this, the Vgate WiFi iCar2 OBD scanning tool can read and clear diagnostic trouble codes such as Check Engine Light and other generic and manufacturer specific codes.

Unlike most other OBDII scanning devices in its segment, the Vgate WiFi iCar2 ELM327 tool can be ordered in an assortment of colors including black and orange. This plug-and-play OBDII scanning tool is easy to use and is backed by a 1-year hassle free warranty against any manufacturer defects.


  • Works with American, European and Asian made vehicles
  • Compatible with both iOS and Android
  • Supports all vehicles of model year 1996 and newer
  • Compliant with most OBDII protocols
  • Can read and clear Check Engine Light, generic/manufacturer specific codes


  • Doesn’t power up on its own when the vehicle is started again
  • May not connect well with some third party apps


The Vgate WiFi iCar2 OBDII Elm327 Code Reader comes slots in at the last position on this list of best OBDII hardware for its excellent diagnostic performance for all 1996 and newer vehicles including cars and trucks sold in the USA.

Easy steps to use the scanner.

But that’s not all, it even supports American, European and Asian made vehicle, and most if not all OBDII protocols including CAN, KWP2000, ISO9141-2, J1850 VPW, and J1850 PWM.

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Final Thoughts

ELM327 technology has made it easier to diagnose several issues with your vehicle right in the comfort of your home. This saves you a considerable amount of cash, given that you don’t have to take your car to the mechanic for something that can be easily fixed by you such as a headlight.

But in order for the best ELM327 hardware to work, it should be connected with the best ELM327 app to render the information. The ELM327 hardware and software mentioned on this list are some of the best available in their respective segments, and some of the paid apps even come with premium features that will help you gag what’s wrong with your vehicle in real time.

Bonus: 10 Best OBD2 Apps (iOS/Android) For Car Diagnostics Review 2021

4/5 (24 Reviews)