Best Obd Ii Engine System Diagnostic Tools 2025

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Last Updated - 09/06/2025

Best Choice

01

XTOOL

XTOOL AD20 Pro OBD2 Diagnostic Tool Car Scanner All System Scan, Obd2 Reader with DTC Definition, Oil Reset, 11+ Languages, Voltage Detection, Lifetime Updates, iOS and Android

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9.6

Exceptional

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Unique gift ideas: workshop owner, car engineer, professional home mechanic, retired backyard mechanic, DIY beginner, etc. Every car owner will need it.
TURN OFF THE ENGINE LIGHT AND READY YOUR CAR FOR TUV TEST (SMOG TEST): This fault code reader can scan the powertrain module (PCM) to retrieve emission-related diagnostic trouble codes (DTCs), still images and data streams (PID) to show why the Check Engine Light (MIL) is on, Car problem and how to fix it effectively using possible causes and solutions. This car scanner can also prepare your car for the TUV test with the standby status check function.
TRACK YOUR CAR PERFORMANCE The car diagnostic with code reader works best when paired with your car and connected to the OBD2 port. This unique OBD-II engine system diagnostic tool provides a performance test and ride (analysis) that allows you to track engine performance (acceleration, fuel efficiency), coolant temperature, engine speed, voltage, etc. while sending alerts to your phone once an error code is detected while driving. NOTE: This car code reader shuts off when the ignition is turned off.
Support of the German language and wide compatibility. The car diagnostic tool XTOOL AD20 Pro supports German. You can switch the device to the German language so you understand everything well, and you can also switch to English, Spanish, French, Italian and other languages, which is convenient for different language groups. AD20 Pro is suitable for most 12V American cars manufactured after 1996, as well as European and Asian cars manufactured after 2000. 24V heavy duty trucks and motorcycles are not supported. Compatible with iOS and Android systems.
LIFETIME UPDATES AND CUSTOMER SERVICE: The XTOOL Advancer AD20 Pro car diagnostics comes with a 2-year warranty, 24/7 technical support and lifetime software updates. If you need any help, please do not hesitate to contact us directly for a quick response. We are always there for you!
Full System Scan Tool >> Most OBD2 scanners have only 10 full OBDII functions and cannot diagnose and analyze all systems of your vehicle. XTOOL AD20 Pro intelligently scans all your vehicle's systems and accesses the Deep Check feature that allows you to thoroughly check vehicle systems such as engine, transmission, brakes, steering, safety, infotainment and more. It reads vehicle information, reads/eliminates codes, turns off warning lights, analyzes all performance changes in text format and gets a complete picture of your vehicle. Read a code once and it pays for itself.
Easy to install and use: XTOOL AD20 Pro car diagnostic scanner is equipped with fast BT 5.0 connection, can pair with iOS and Android devices, download the "Advancer AD20" from Google Play or App Store to a wealth of functions, including, check engine light on, full system diagnostics, full OBD2 test modes, etc. This OBD2 scanner is a cost-effective way for DIY enthusiasts to read/delete codes before taking it to the dealer.
Detailed explanation of the error code and error code warning: the car reader has diagnostic functions with fault code definitions, which are extremely useful for the car owner to fix vehicle problems or replace faulty components. There is also an error warning function. If your vehicle has error codes or the coolant temperature is too high, you will receive alerts on your smart device to understand the fault and ensure safer driving.
BT connection problem ---- Please check the following cases to determine the cause. ●1. Please check the OS version of your device as the scanner is compatible with Android 4.4+ (64-bit processor) and iOS 11+ devices. (Android devices with 32-bit processor are not compatible because they are relatively old on the market) ●2. Please make sure the dongle is firmly inserted into the OBDII port. ●3. Please make sure the network is stable. ●4. Please make sure the vehicle is started or the ignition switch is set to "ON".

59,99 €
Value for Money

02

Veepeak

Veepeak OBDCheck BLE+ Bluetooth OBD II EOBD Diagnostic Device Adapter Plug Car Diagnostic Scanner for iOS and Android

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21% Off
9.3

Excellent

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Vehicle compatibility - Compatible with petrol vehicles from model year 2001 and diesel vehicles from model year 2004 for general OBD-II functions (check engine light diagnosis). For plug-in hybrid and electric vehicles, please check the app car scanner ELM OBDII and check if there are suitable EV connection profiles or other apps specially designed for electric vehicles. Note: Please make sure your OBD port is in good condition and the device is firmly in place to connect to the vehicle ECU.
Useful for car owners: OBDCheck BLE+ is a small and practical OBD2 diagnostic tool that can work with different third-party apps to achieve different functions. The functions you can get depends mainly on the selected app and your vehicle. Please read the "Instructions for Use" on the detail page "Product Guides and Documents" before purchase or use. [English language not guaranteed].
Note: Currently, no Veepeak app is included with this device; Third party apps are required but not included and must be downloaded or purchased separately from the Play Store or App Store (depending on vehicle and requirements); NOT compatible with pre-2008 or G series models when used with BimmerCode or BimmerLink; NOT compatible with Bluedriver, Carly, MHD, xx. HP, HP, ProTool.
Do more: (advanced features for select vehicles, see image 3 for details) - When used with more professional apps (usually requires a separate purchase), you can get advanced features such as advanced diagnostics* (ABS, airbag, body control, etc.) and manufacturer-specific PIDs (such as transmission temperature, oil pressure), inspect the HV battery in hybrid and electric vehicles, adjust selected vehicles, etc. *To check whether your vehicle for advanced diagnostics, please see the fourth picture on the product page. Note: The oil service light cannot be reset.
Diagnostics of the engine check light (basic functions) - When used with generic OBD II apps such as car scanner ELM OBDII (see picture 2 for more compatible apps), you can read and clear engine diagnostic trouble codes (CEL, MIL, SES), display I/M readiness and sensor values in real time (such as O2 values, engine coolant/oil temperature. air mass flow m, fuel distributor pressure, fuel trimming), which can help you solve simple engine problems.
Device compatibility - Compatible with iOS via Bluetooth LE (do not connect to the device in iOS Bluetooth settings; please connect directly in the OBD2 apps) and Android devices via classic Bluetooth (main units may not be compatible). Detailed instructions on how to connect and troubleshoot iOS and Android can be found in the fifth product image or the user manual. [English language not guaranteed].

39,00 € 49,99 €(21% Off off)
03

Veepeak

Veepeak OBDCheck BLE/Bluetooth 4.0 OBD II Car Diagnostic Tool, Diagnostic Code Reader, Scanner, Compatible with iOS and Android

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10% Off
9.1

Excellent

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Main highlights

Vehicle compatibility: Compatible with petrol vehicles from model year 2001 and diesel vehicles from model year 2004 in the EU and UK (only for basic functions; advanced features are only available for select vehicles via advanced apps). For plug-in hybrid and electric vehicles, please check the Car Scanner ELM OBDII app and check if there are suitable EV connection profiles or if there are other apps specially designed for electric vehicles.
Please read before purchasing: OBDCheck BLE is a small and practical OBD2 diagnostic tool that can work with different third-party apps to achieve different functions. The functions you can get depends mainly on the selected app and your vehicle. Please check the compatibility and app information in the product images and read the instructions for use found in the product guides and documents (English language not guaranteed) before purchase or use.
Important note: Not compatible with pre-2008 or G-series models when used with BimmerCode or BimmerLink. Currently, no Veepeak app is included with this device; third-party apps are required but not included and must be downloaded separately or purchased from the Play Store or App Store (depending on vehicle and requirements); not compatible with Carly, MHD, xHP, ProTool apps.
Device compatibility: Compatible with iOS via Bluetooth LE (do not pair the device in iOS Bluetooth settings; please connect directly in the respective OBD2 app), and with Android devices via classic Bluetooth (head unit compatibility not always ensured). Detailed instructions for connecting and troubleshooting for iOS and Android can be found in the fifth product image or user manual.
Basic functions (for diagnosing the check engine light on OBD II-compatible vehicles). When used with generic OBD II apps such as Car Scanner ELM OBDII (see picture 2 for other compatible apps), you can read and clear diagnostic issue codes related to the check engine light (CEL, MIL, SES), snapshot data, display I/M readiness and sensor values in real time (generic OBD PIDs such as engine coolant/oil temperature, mass air flow, fuel trim falues), which can help you solve simple engine problems.
Advanced features (for select vehicles, see image 3 for details): When used with more professional apps (usually requires a separate purchase), you can get advanced features such as advanced diagnostics* (ABS, airbag, chassis control, etc.) and manufacturer-specific PIDs (such as transmission temperature, oil pressure), inspect the HV battery in hybrid and electric vehicles, adjust selected vehicles, etc. *To check whether your vehicle is compatible with the advanced diagnostics, please see the fourth picture on the product page. Note: The oil service light cannot be reset.

35,99 € 39,99 €(10% Off off)
04

ANCEL

ANCEL AD310 OBD2 Diagnostic Tool Car, Reader Car OBD-II Diagnostic Tools, Engine Fault Code Reader, OBD2 Car Diagnostic Tool for All Vehicles Since 1996 & Newer (Black)

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21% Off
8.8

Very Good

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Main highlights

Robust and compact: Equipped with a 2.5 foot long cable made of a very thick, flexible insulation. Car reader is important to have a stable scanner as it can easily fall to the ground when working in a car. The AD310 OBD diagnostic tool is a well-constructed device with a slim design. It weighs 12 ounces and measures 8.9 x 6.9 x 1.4 inches. Thanks to its compact design and light weight, transporting the device is no problem. The buttons are clearly labelled and the screen is large and shows the results clearly.
OBDII protocols and vehicle compatibility: Many cheap car reader do not really support all OBD2 protocols. This is not the case with the AD310 obd-ii diagnostic tools, as it can support all OBDII protocols such as KWP2000, J1850 VPW, ISO9141, J1850 PWM and CAN. This unit also has comprehensive vehicle compatibility with 1996 US based, 2000 EU-based and Asian cars, small trucks, SUVs, as well as newer OBD2 and CAN vehicles both domestic and foreign. Please check the compatibility with your vehicle model before purchasing.
OBD2 diagnostic device: ANCEL AD310 is one of the best-selling OBD2 car diagnostic device on the market and is recommended by Scotty Kilmer, a YouTuber and car mechanic. It can easily determine the cause of the check engine light comes up, quickly read and clear diagnostic error codes, read live data and hard memory data, view freeze frame, I/M monitor readiness and collect vehicle information. Instead of bringing the car to the workshop, you can use it to check the error code and show code definition yourself.
Note: 1. ABS/Airbag/SRS codes are not supported, can only read engine system data. 2. Not compatible with French and Japanese vehicles before 2004 such as Opel/Mazda. We recommend that you check the compatibility with your model before purchasing. You can contact us at any time.
Home necessity and worthy to own: This is an excellent OBD2 diagnostic device for travelling or at home, as it weighs less and it is compact in design. You can easily slide it into your backpack when you go to the garage, or put it on the dashboard, this will be a great fit for you. The AD310 is not only portable, but also accurate and fast in performance. In addition, it covers different car brands and is suitable for people who only need a code reader to check their car.
Accurate quick and easy to use: AD310 car diagnostic tool can help you or your mechanic understand whether your car is in good condition, provides exceptionally accurate and fast results, reads and clears engine error codes in seconds. If you want to find out the cause of the check engine light, car diagnostic device and fix the problem immediately and without any car knowledge. No need for batteries or a charger, get power directly from the OBDII Data Link Connector in your vehicle.

31,49 € 39,99 €(21% Off off)
05

Veepeak

Veepeak Mini Bluetooth OBD2 Scanner Diagnostic Tools Car Diagnostic Engine Code Reader for OBD II/EOBD Vehicles for Android

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8.7

Very Good

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Main highlights

Save time and money by finding out why the engine indicator light lights up, and fix simple car problems yourself! Read engine diagnostic fault codes, reset engine light and check if your vehicle is ready for emission testing.
Not compatible with iPhone or iPad! Only works with Android devices and Windows PCs. Very useful tool for car owners to diagnose engine light and monitor vehicle performance.
Compatible with cars and light trucks since year 2001 (petrol) or 2004 (diesel) in EU (domestic and imported). -
Access a whole new world of information about your vehicle directly on your phone or tablet. Display sensor data (engine coolant and oil temperature, O2 values, air mass flow, fuel adjustment, etc.), monitor fuel consumption, create your own dashboard and more.
A third-party OBD2 app is required. Turn your phone or tablet into a sophisticated diagnostic scan tool.

17,99 €
06

UWALK

OBD2 Diagnostic Device Bluetooth OBD Adapter: Bluetooth 5.4 OBD2 Code Scanner Car Diagnostic Scanner - OBDII Diagnostic Device Car for Vehicles with All System Diagnostics - Compatible with iOS

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8.4

Good

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Main highlights

Superior speed and stability: thanks to Bluetooth 5.4 technology, this OBD2 scanner offers ultra-fast data transmission, improved connection stability and energy efficiency. It exceeds older Bluetooth versions and ensures fast and reliable diagnostics. You can also accurately evaluate the performance of your vehicle through three key diagnostics - acceleration, braking and distance travelled. This gives you deep insights into your car's performance and can optimise your driving technique to achieve a smoother and more efficient driving experience.
Interactive dashboard display: Turn your smartphone into a comprehensive digital dashboard that displays detected data in clear and easy-to-read charts. Even beginners can use it without any problems. The dashboard displays important readings such as speed and speed, with the OBDII function minimizing distractions by displaying important information at eye level, promoting safer driving habits, and improving safety and comfort when driving.
Easy setup: Setup is a breeze - simply scan the QR code on the packaging or in the instructions, install the app and pair the scanner with your iOS, Android or Windows device. The intuitive design and simple instructions make it accessible to users of all skill levels. Our manual contains detailed instructions, and in case you have any questions about our products or encounter any problems during use, you can leave us a message on Amazon (vehicle make/year/model).
Comprehensive fault code location: Identify, fix and delete fault codes quickly and easily with a simple scan. By detecting and clearing fault codes, you can better understand the condition of your vehicle, ensure optimal performance and reliability, and avoid unnecessary workshop visits. The OBD2 scanner supports over 100 brands and 100,000+ vehicle models in 24 languages. In addition, you can download all test results as detailed PDF reports for comprehensive analysis, maintenance and troubleshooting.
Bluetooth OBD2 Real Time: Vehicle Safety Monitoring - OBD2 scanner perform various performance tests, including speed performance analysis, displacement calculation and fuel consumption analysis, but also perform important functions such as battery condition test, freeze frame data analysis, sensor tests, vehicle monitoring and evaporation system tests, allowing you to monitor the performance of your car in real time, ensure optimal driving conditions. and problems early can recognize.

33,99 €
07

Vgate

Vgate iCar Pro Bluetooth 4.0 (BLE) OBD2 OBDII Error Code Reader Car Check Engine Light with ELM327 Adapter

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8.3

Good

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Main highlights

● Works with many popular OBD2 apps – The Vgate iCar Pro Bluetooth Low Energy device works with most popular OBD apps. Please see the product description for the instructions for Android and iOS devices.
● Fit and forget – with its micro size and the unique energy-saving function that protects your battery, it is really possible to fit and forget.
● Easy fitment: the majority of cars manufactured in the last 2 decades are equipped with an OBD2 diagnostic port, simply find the port and plug the iCar Pro in.
Have you ever had a warning light on your dashboard light up, but don't want to pay hundreds of pounds to find out what's wrong? This iCar Pro code reader will help you to save money and to accurately diagnose engine light problems. Easy to use.
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27,69 €
08

thinkcar

Thinkcar THINKOBD 100 OBD2 Diagnostic Tool, Improved Universal Code Reader, Motor Scanner with Full OBD2 Functionality, Premium Car Reader for All OBDII/EOBD Protocol

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8.2

Good

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Main highlights

【Wide vehicle coverage】- Thinkcar car reader, compatible with most US cars from 1996, EU cars from 2000, as well as in vehicles manufactured after 2008 Asia, supports up to 8 vehicle languages: German, English, French, Spanish, Russian, Italian, Polish and Portuguese. It supports all OBDII protocols ISO 14230-4(KWP2000), ISO 15765-4(CAN), ISO9141-2(ISO), ISO14229(UDS), SAEJ1850(VPW&PWM).
【The most time-saving code reader】- Simply connect the diagnostic device to the OBDII port and turn on the ignition and the device starts the error analysis. OBD2 code readers are much faster than other OBD-II diagnostic tools. No batteries required or download apps. A car reader for car diagnostics anytime and anywhere. Save money and time on repair in the workshop.
Professional OBD2 diagnostic devices: save money and time on repair in the workshop. With this car diagnostic device, the user can quickly identify error codes. Repairs, road testing, condition checks, emission monitoring status and engine problems.
Note: If you delete the error code directly without repairing the car, and find that the error code is still there, your car hardware error is still present. We recommend that after reading the error code, repair the car first and then delete the error code.
Effective vehicle condition analysis: with this car reader you can display live data in real time. This information includes the values (voltage, speed, temperature, speed, etc.) and system status information (open loop, closed circuit, fuel system status, etc.) generated by the various vehicle sensors, switches and actuators.
Advanced OBD2 diagnostic tool: This car diagnostic tool makes it easy to determine the cause of an engine malfunction, quickly read and delete diagnostic error codes. Supports multi-functions: read / clear codes, 1/M readiness, live data stream reading, EVAP system test, on-board mintor test, O2 sensor test, read freeze frame data, fault code search, vehicle information read, calculate load value, retrieve engine coolant temperature, retrieve engine speed.

26,98 €
09

HyAdierTech

HyAdierTech OBD2 Diagnostic Tool, V310 OBDII Diagnostic Tool with Full OBD2 Functions, Engine Fault Code Reader, Car Diagnostic Device, Scanner CAN Diagnostic Tool for All OBD II Protocol Cars

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10% Off
8.1

Good

Our rankings are cleverly generated from the algorithmic analysis of thousands of customer reviews about products, brands, merchant’s customer service level, popularity, trends and more. The rankings reflect our opinion and should be a good starting point for shopping.

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Main highlights

WIDE VEHICLE COMPATIBILITY - Our car code reader supports 9 protocols compatible with most US based, 2000 EU based and Asian cars from 1996 as well as newer domestic or imported OBD II CAN vehicles. It supports 6 vehicle languages: English, German, French, Spanish, Italian, Dutch, which allows car owners worldwide to have accurate and fast diagnosis.
Unique and compact design - The OBD2 tool is equipped with an LCD screen that allows super clear display of test results and makes it easier to read and use in all lighting conditions. The ergonomic handle design makes it easier to use and transport, does not take up space and helps you say goodbye to the problems of large and uncomfortable card readers in the car.
Multiple OBDII diagnostic functions - The practical OBD2 code reader has several functions, such as B. full diagnosis of your vehicle's data and display graphical data streams: calculated load values, engine coolant temperature, vehicle speed, engine speed, etc., display code definitions, view still images, vehicle information displays, I/M preparation and more. It is a vehicle code reader that reads and clears OBD engine codes and displays all vehicle information when an error code has been triggered.
Easy to use - The universal OBD2 diagnostic tool is "plug and play", reads and clears error codes quickly and is very easy to use even for beginners. Simply connect the diagnostic tool to the OBDII port and turn on the ignition and the device will start the fault analysis. No batteries or download the apps; a vehicle reader for vehicle diagnostics anytime, anywhere.
ABS & AIRBAG CODES ARE NOT SUPPORTED - It is able to read and clear engine information that is part of OBDII system, but does not work with non-OBDII systems, including ABS with airbag with oil service light, etc.

26,99 € 30,00 €(10% Off off)
10

TOPDON

TOPDON AL400 OBD2 Diagnostic Tool 10 OBD2 Modes, One Touch I/M Readiness Button, Lifetime Updates, 2.4 Inch TFT Colour Screen for Cars 1996 Onwards

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23% Off
8.0

Good

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Main highlights

We provide user manuals and quick start guides to help you get started (English language not guaranteed).
Used by professionals and DIY enthusiasts: DIY enthusiasts can use the AL400 to check their vehicles at any time if a problem occurs. Professional technicians can easily carry the AL400 for roadside assistance and at home. Suitable diagnostic tool for small workshops. The AL400 can solve problems related to car engine systems.
Industry leading coverage: The AL400 works with most US vehicles manufactured after 1996 and with European and Asian vehicles manufactured after 2000. Compatible with J1850 PWM, J1850 VPW, ISO9141, KWP2000 and CAN protocols. Supports 7 languages: English, French, Spanish, German, Italian, Portuguese and Russian.
Easy to use: The compact design makes it easy to store in your toolbox or glove box. The easy-to-read 2.4 inch (6 cm) TFT colour screen with backlight displays the test results even in the dark. Lifetime updates can be performed by connecting to a computer to maintain coverage.
10 OBDII full functions: The AL400 is a mid-range OBDII code reader with full functionality. With integrated DTC search to determine the cause of the engine light, ability to quickly read/clear generic codes and manufacturer-specific codes (P1, P3 and U1), display of the still image data, graphical live data, O2 sensor test, EVAP test (mode $ 8), one touch I/M readiness button, retrieve vehicle information and identify basic vehicle problems.

34,98 € 45,98 €(23% Off off)