We’ve spent hundreds of hours researching and comparing Diesel Diagnostic Tools of all specifications to find the best one for any need (or budget). Here are the results.

The Best Diesel Diagnostic Tools of 2020 – Top Rated & Reviewed

2,327 Reviews Scanned

Rank No. #1
Autel Maxisys CV MS908CV, Heavy Duty Truck Scanner, Semi Truck Scanner with J-2534 ECU Programming, Coding, Active Test, 25 Special Services, 23 Adaption Functions, Bluetooth Diesel Diagnostic Tool
  • 🚐【25 Special Services + 23 Adaption Functions】 : Autel Maxisys MS908CV, the 2021 new version, is a top heavy duty truck scanner with 25 special services (including Oil Reset, Injector Coding, DPF, EPB, ABS, SRS, Suspension, Throttle ...) and 23 adaption functions (including DOC/DPF Instant Replacement Reset, Fuel Pressure Adaptation Reset, Injector CEOM Reset etc.) to meet all your needs.
  • 🚐【OE-Level Full Systems Diagnosis】: Auel truck scanner Maxisys 908CV is an affordable choice to compete with OEM scanners with more advanced functions, while less budget. Autel diesel truck scanner 908cv can read DTCs to locate the fault, clear DTCs to turn off the MIL, retrieve ECU information to learn about the details and views live data. Full-system diagnosis can be applied to Ford truck, Toyota bus, Toyota truck, Nissan, Peugeot, Astra, Champion, Bendix, and more to include 80+ makes.
  • 🚐【Advanced ECU Coding】: Autel Maxisys cv ms908cv is equipped with advanced ECU coding which allows you to update the vehicle’s computer software to the latest version, or write in adaptive data for certain components after making repairs or replacements. Maxisys 908CV provides hundreds of methods to improve truck’s performance, like drivability, fuel efficiency, etc. Coding function can be perfectly compatible with Citroen, Dodge, Volvo, Gillig, New Flyer, Nova bus, Pierce and etc.
  • 🚐【Designed for Commercial Vehicles】: Autel MS908CV performs diagnosis for heavy trucks, light trucks, natural gas vehicles, construction vehicles, and buses and so on, working with more than 80 commercial vehicle brands, ideal for large repair shops and professional mechanics. As the 2021 new version from Autel, with a 1-year warranty and 24-hour tech support, MS908CV can cover more cars and makes sure that you would not run into any difficulties when using it.
  • 🚐【Best Investment with Active Test】: 🅰🆄🆃🅴🅻 Truck scanner MaxiSys MS908CV provides direct access to the vehicle-specific subsystems and components, and output commands to the specific solenoid/relay/ switch to precisely locate faults. Its bidirectional control is applicable for rolling up / down a window, turning the fuel pump on and off, cycling the a/c clutch on and off, and helping with an emissions leak test.
Rank No. #2
2 in 1 FCAR Heavy Duty Truck Scanner, Full Systems Diesel Trucks Diagnostic Tool with Forced Regen & Oil Light Reset for Hino Isuzu Fuso UD, OBD2 Scanner & HD Truck Freightliner Scanner
  • 🚗 2021 Upgraded--- 1) Covers J1939 J1708 J1587 protocol heavy duty trucks like Ford(6/9PIN), Ford(16PIN), Freightliner, HD Volvo, International, Kenworth, Mack, Peterbilt, Caterpillar, Terex, Case, Bobcat, ATLAS, BLACK, CAT, John Deere and for 1998-2018 Hino, Isuzu, Fuso, UD. 2) Added D-P-F Regen and Oil light reset services for Hino/Isuzu/Fuso/UD, which will cost $600-$2000 in repair shop. 3) Professional support always stand by from FCAR official engineer for any issues of this hd scanner.
  • 🚗 Full Systems Diagnosis--- Auto diagnose major systems for 24v heavy duty trucks like Engine, HVAC(air conditioner), Transmission, ABS, SRS, TPMS, ECM, DME/DDE, EGS, CAS, CBS, ADS, Battery, Headlight, Radio, Video, Telephone, Security to read and clear the error codes(after repair the car fault), show graphical live data, read ECU Information and read Freeze Frame for MACK/Volvo, Freightliner and so on.
  • 🚗 OEM-Level Maintenance Services--- D-P-F Regeneration & Oil Light Reset is special designed for Hino, Isuzu, Fuso, UD(Oil light function not support for UD), which will save hundreds to thousands of dollars on maintenance costs in repair shop. ☞☞☞Warm Tips: Please refer to the ECU’s guide to operate the D-P-F regeneration in a outdoor EMPTY space. NOT allowed to work in a small confined space. The total process will cost 15-45 minutes, please wait patiently.
  • 🚗 2 in 1 Diagnostic Scanner--- Not only a HD scanner, FCAR Pro heavy duty scan tool also supports full modes OBD2 functions for 12v vehicles to read/ clear error codes, show graphical Live Data Stream, read Freeze Frame, do On-Board monitor test(mode 6), EVAP test (mode 8), O2 sensor test, I/M readiness, vehicle information, DTC Lookup and etc.
  • 🚗 Worth to Own with No Subscription--- ☑ Any issues, send the log file back for further check of engineer; ☑ Add on individual menu for MACK/Volvo OBD16 pin and Freightliner Green 9pin in Diesel OBD(💡Note: Green 9pin connector NOT included); ☑ Add on special main menu for Hino, Isuzu, Fuso, UD(💡UD volvo NOT applicable to this menu); ☑ Add on one-key screen capture(Long press "OK" button) and data playback function; ☑ 3.5” Large LCD screen with brightness adjustment; ☑ More waiting for you...
SaleRank No. #3
[2021 New] LAUNCH X431 PRO3S+HDIII,Diesel&Gasoline Bidirectional Diagnostic Scan Tool,Cars&Heavy Duty Trucks All Systems Scanner,Key Program,ECU Coding,31+Service,Cars&Trucks Connector Kits
  • 🏆【2021 NEWEST LAUNCH FIRST Advanced Scan Tool Compatible With 12V And 24V Vehicles】Design for Passenger&Commercial Vehicles 2in1:The 1st ALL-IN-ONE scanner from LAUNCH ,work for Cars/Trucks/buses/trailers/excavators/diesel engine/construction machinery/ /pick-up/etc.【AutoAuth for FCA SGW】Support Chrysler,Dodge,Jeep,Alfa Romeo and Fiat after 2017【2021 OE-Level features】Guiding Functions,Variant Coding with Benz,Modification for BMW,Offline Coding,Customization,Personalization,Online Calibration.
  • 🚗【Over 31 Service Reset Functions + Bi-Directional + ECU Coding + Adaptation + Intialization + Matching】LAUNCH X431 PRO3S+ HDIII can send commands to the system/component to test their working status for Active Test. Beside,this scan tool can also support ECU Coding, Key programming, Adaptation, Matching, 31+ reset service functions like SAS/EPB/TPMS/DPF/IMMO/Oil/Brake/GEARBOX Reset, ABS Bleed, Injector coding, etc... Powerful dealership level Functions can fully meet your needs.
  • 👍【2021 BEST Advanced Hardware & All Systems Diagnosis】LAUNCH X431 PRO3S+ HDIII automotive scanner equipped with Android 9.0 operating system, 10.1-inch HD IPS(1920*1200) touchscreen, 7000mAh rechargeable battery (up to 12+ hours battery life), 3+32G memory(support 128G Expand memory). Support All systems Diagnostic including ENG, AT, ECM, TCM, ABS, SRS, BCM, IMMO, BMS, TPMS, SAS, Fuel System, Light System and A/C system,more.
  • 🚛【Wider Vehicle Coverage of 12V & 24V Vehicles + 24 Languages】LAUNCH X431 PRO3S+ HDIII automotive scanner is ALL-IN-ONE Scan Tool for 12V cars and 24V Heavy-duty trucks which provide the most extensive multi-brand coverage and comprehensive diagnostics for you. Passenger vehicles:Cars, SUV, MPV, Pickup truck; Commercial vehicles:Heavy Duty Truck, Passenger Bus, Excavator, Tractor, Recreational Vehicle. 24 Language: English,French,Spanish,German,Russian,Japanese,Portuguese,Italian,Polish,more.
  • 🔥【User Friendly, Easy To Use】LAUNCH X431 PRO3S+ HDIII supports One-Click Auto VIN Detect, One-Click WiFi Update, One-Click Generate Graph. In addition, this LAUNCH scan tool also support remote diagnostic, diagnostic feedback and respond, Live data graphing, data Stream record and playback, Generate Health Report (Share & Print). Bring you a more convenient and comfortable experience to a large extent.
Rank No. #4
FCAR F506 heavy duty truck scanner Enhanced HD diesel scanner Full-systems diagnostic tools with Engine/ABS/VCS/EBS/SRS/Suspension/Battery/Cluth Transmission Check Trucks & Cars 2 in 1 Codes Reader
  • ALL FUNCTIONS IN YOUR HAND-This truck scanner is capable of reading and clearing trouble codes of all major systems of truck , including engine, airbag, transmission,ECU/BCU,VCS,ABS,SRS,EBS,DCU,AT, cluth system/brake system/meter system/battery system/inverter system/hybrid system/immobilizer system,ect. Special Functions perform various component adaptations of the control module under test, allowing you to calibrate or configure certain components after making repairs or replacements.
  • ADVANCED FEATURES FOR TRUCK-Graph live data :Engine speed,Engine ECU temperature,Percent acceleration pedal position,Engine intercooler temperature,Engine coolant temperature,Battery voltage,Alternator voltage,Ambient air temperature,Air inlet temperature,Set measurement units in SAE English/Metric.,Internet upgrade,General Functions :Read ECU Information,Read and Erase Fault codes,Read Live Data,Read Freeze Frame,Graph Live Data,Screenshot Function.
  • EXTENSIVE APPLICATION-HD Trucks: for Freightliner, for Fuso, for GMC,for Hino, International, for Isuzu, for Iveco, for Kenworth, for Mack, for Mercedes, for Nissian UD,Peterbilt, Sterling, for Western Star, for Volvo,for Allison, for Bendix, for Eaton, for Wabco, for ZF,ect.and all Cars/min vans/light duty from 1996.F506 code reader can be also used as a universal OBD II code reader for reading and erasing codes on other brands cars' OBD System.
  • STRONG COMPATIBILITY-Works on most truck with J1708 and J1939 plus OBD2 automotive coverage, and covers Hino, Mishubishi Fuso, Isuzu and Nissan UD commercial vehicles. since 1992 Supports SAE J1850PWM, SAE J1850 VPW, IS0 14230-4, IS0 9141-2,IS0 15765-4, SAE J1708, SAE J1939, OBDII Scan and diagnose fault codes with code defination in the engine, transmission, ABS brake and instrument cluster or body control.
  • WIN IN THE DETAILS-The F506 obd2 scanner comes with new UI, new processor and new software, aims at providing you the best diagnostic experience. One-key update, 3.5”TFT color screen and languages will make you fall in love with it instantly. The response and operating speed increased by 60% at the same time. This durable tool is ruggedly built, perfect for both shop and road tests. It can be used directly out of the box.
Rank No. #5
iCarsoft HD V3.0 Heavy Duty Diesel Truck Diagnostic Scanner Tool Code Reader Freightliner Cummins
  • COMPATIBLE WITH all heavy duty trucks in compliance with standard protocols (J1587, J1939 and J1708).
  • BEST IN CLASS INNOVATION- iCarsoft HD V3.0 can do it all-reads and clears trouble codes on most systems such as engine, transmission, ABS and airbag etc. Supports OBDII/EOBD, with Ten Modes of Operation, read live data, full ECU diagnosis etc.It automatically detects your car model and scans all modules for error codes. This special technology allows for specific diagnostic functions and testing!
  • DYNAMIC TEST CAPABILITIES- The Multi-lingual function allows you to view & graph live data in color while graphing at a blazing fast refresh rates for quicker results. Our OBD2 scanner allows you to read pending DTCs and permanent DTCs with a DTC Library to lookup while operating the tool. Providing you with accurate data results for all your error codes
  • DIAGNOSTIC FUNCTIONS & ADVANCED FEATURES- Along with the standard OBD functionscalibrate,Headlamp adjustment,Freeze Frame, O2 Sensor Test, and Evap System Test are just a few of the special functions this professional quality car scanner provides
  • TRY IT RISK FREE- Whether you’re your own personal auto mechanic or you’re a business owner, you’ll fall in love with our compact design of this diagnostic scanner. Its pocket-size and perfect for allowing diagnostic tests inside or outside of the car. No batteries required just plug it into the OBD II port and you’re all set. If for any reason you are not 100% satisfied, please contact us for a full hassle-free refund or replacement!
Rank No. #6
Autel AL529HD with Free Screen Wiper Heavy Duty Code Reader Diesel Truck OBD2 car Diagnostic Scan Tool(Advanced AL519/AL529 + J1939 & J1708)
  • 10 MODES OF OBDII: Live data, freeze frame data of this diagnostic tool are effective to get quick & precise test results of your vehicle health status. Moreover, I/M Readiness, O2 sensor test and On-board monitor test are great for passing the emission test smoothly.
  • UPGRADED AL519: Compared with AL519, this code reader uses AutoVIN technology that is a set of the latest manufacturing standards. It reduces the omissions, eliminates the manufacturing defects and processes the data at a faster speed.
  • ENHANCED MODE 6: The scanner features the enhanced mode 6 access to read the definition of an On-Board Diagnostic Monitor ID, along with enhanced reading codes in Powertrain system for Ford, GM and Chrysler, for offering better insight into your car.
  • VEHICLES COMPATIBLE: This diagnostic scan tool has been found to cover both diesel (J1939 and J1708) and gasoline vehicles which are OBDII protocol compliant. The enhanced compatibility of this scan tool makes it a solid choice for every DIY users and mechanics.
  • WARRANTY & UPDATE: A complete 12-month guarantee from the date of purchase
Rank No. #7
LAUNCH Autool X431 HD Heavy Duty Diesel Truck Diagnostic Module Work for X431 V+, X431 Pro3,PAD II Software Free Update Online
  • X-431 Heavy-duty Truck Module is a new generation heavy-duty truck fault diagnostic tool Software based on Android, matching with more diagnostic hosts.
  • Able to test truck with 12V or 24V battery diesel engine. When testing 24V truck, battery conversion is not required.
  • It communicates with X-431 PRO3 / X-431PAD II throuth Bluetooth to achieve fault diagnosis for various car models and full systems.
  • 34 car model software, support more than 60 car models. Moreover, the software is being continuously developed.
  • 1 year free update online / 1 year hardware warranty
Rank No. #8
XTUNER T1 Heavy Duty Truck Diagnostic Tool Auto Intelligent Diesel OBD Scanner Support WIFI
  • EXTENSIVE VEHICLE COVERAGE: XTUNER T1 has extensive vehicle coverage for heavy-duty trucks like Allison, Astra, Benz, Bremach, Caterpillar, DAF, Detroit, ERF, Foton, Freightliner, Hino, Hyundai, International, ISUZU, Iveco, Mack, MAN, Navistar, Diesel OBD, Renault, Scania, Toyota, UD, Volvo, Wabco; Support electronic system like Bendix, Cummins
  • FREQUENTLY UPDATE: Newest Update:MAN V12.1->12.2 !!! 1.Add Divided by the Vehicle->TG-X System:Wabco ESAC,PTM,ASTRONIC ZF,Air-conditioning/Auxiliary air-conditionong/Heating,Instrumentation Stoneridge Electronics,CBR II Wabco,Universal mobile phone preparation(UHV)FWD,Door module TRW,Multi Media System. 2.Add Divided by the System:Multi Media System. TOYOTA V12.2:Update the diagnostic database for all models of North America, Europe, Asia, Japan, other support to 2016
  • Add New Brand: Ford!!! Vehicle Covered up to 2017! VOLVO 12.2 EN release! 1. Fix commucation error. Add 35 new modules. 3. Add system scanning and DTC Freeze. XTUNER T1 support communication via USB or WIFI connection for the VCI; Software support update online for free; Operation System: Windows XP, Windows 7, Windows 8, Windows 10, which allows for more stable performance, better compatibility and expandability
  • BUILT-IN OVERVOLTAGE PROTECTION MODULE: Able to protect scanner and vehicle against accidental damage during checking; Work stably and smoothly in high and low temperature environment. Please feel free to contact us if you have any technical question, our engineer will support online
Rank No. #9
Heavy Duty Scan Tool | Detroit Diesel Engines 2007 – 2021 | Read Fault Codes | Check Engine Lights | MIL | Aftertreatment Lights | Diagnostic Scan Tool | OTR Diagnostics
  • KNOW WHAT THE LIGHTS ON THE DASH MEAN: Read your check engine lights, MIL, aftertreatment lights from one location
  • UPGRADEABLE: Additional capabilities are available that includes clearing fault codes, resetting aftertreatment, forced DPF regen and more. Requires a PLUS or PRO subscription from otrperformance.com
  • WORKS ON: Freightliner, Western Star trucks.
  • ENGINE COVERAGE: DD60 (2008-2010), DD13 (2007-2020), DD15 (2007-2020), DD16 (2007-2020) engines
  • AVAILABLE on Android and iOS mobile devices.
Rank No. #10
Quicklynks Truck Diagnostic Tool T71 Universal Diesel Heavy Duty Code Reader V24 for Bus and Heavy Truck Diagnostic Scanner Tool for Benz/Isuzu/Cummins/Iveco/Volvo Truck
  • Truck diagnostic tool T71 works on vehicles which compliance with J1939/J1587/1708 protocol.
  • T71 Truck Diagnostic Tool For Heavy Truck and Bus Code Reader,Easy to use with friendly menu truck diagnostic interface
  • Functions of Truck Diagnostic Tool T71 including: Reads trouble code, rases trouble codes and resets check engine lights,Identifies and displays Pending Codes,Determines the malfunction indicator lamp (MIL) status and so on.
  • Truck Diagnostic Tool T71 Update software on Offcial Website.
  • T71 Diesel Truck Diagnostic Scanner 24V Heavy Duty Truck Diagnosis Computer Tester Truck Scan Tool for Benz/Isuzu/cummins/iveco/volvo truck.

Last update on 2021-06-12 / Affiliate links / Product Titles, Images and Descriptions from Amazon Product Advertising API

Top Rated Diesel Diagnostic Tools to Buy Now


Why You Should Buy Best Diesel Diagnostic Tools from Amazon

Amazon is not the only store that sell Diesel Diagnostic Tools. However, there are several compelling reasons why you should buy Diesel Diagnostic Tools from them, with the suitable Price and Reviews. Here are five:

(1) Amazon Makes Shopping Diesel Diagnostic Tools Personal

Amazon is very good at making recommendations of Diesel Diagnostic Tools based on your search history. From time to time, they will even show you discounted prices on Diesel Diagnostic Tools that you previously expressed an interest in. They also make your shopping experience a little easier by showing you items that you recently viewed.

(2) Amazon Checkout is Easy

Amazon checkout is easy, especially if you already have an account. You can add Diesel Diagnostic Tools to your cart and go through a multi-step checkout process, or you can buy Diesel Diagnostic Tools with only one click by using your stored credit card information.

(3) Amazon Has Lots of Social Proof

Before you make a purchase for Diesel Diagnostic Tools, you want to know that the company you are dealing with is legitimate and that others trust the company enough to make a purchase. You may also like to read what others are saying about the product in the review section. Amazon does all of this quite well.

(4) Amazon Has Great Diesel Diagnostic Tools Images and Descriptions

In addition to still images, many of Amazon’s Diesel Diagnostic Tools have videos. This makes it easier for you to see exactly what you are purchasing. Amazon’s Diesel Diagnostic Tools descriptions are also quite good. In many cases, Amazon repeats the descriptions furnished by the manufacturer. In other cases, they write their own.

(5) The Amazon Site is Easy to Navigate

Navigating the Amazon site is easy. Even though the site is huge, you will not feel overwhelmed when searching for Diesel Diagnostic Tools. This is partly due to Amazon’s filtering process. You can search for items by brand, price or user rating. You can also search for specific features.

How to Choose the Best Diesel Diagnostic Tools (with Price and Reviews)

Although most Diesel Diagnostic Tools are similar, there are several differences worth noting. Here are nine criteria to consider when choosing an Diesel Diagnostic Tools:

(1) Diesel Diagnostic Tools Price and Reviews

Although price is not the only factor to consider, it is nevertheless extremely important. The price of an Diesel Diagnostic Tools should be in line with its value. You can compare Diesel Diagnostic Tools reviews to make sure you are getting a fair price. This is easy to do on Amazon.

(2) Demand

The demand for a particular Diesel Diagnostic Tools is a good indication of its ability to perform the functions for which it was designed. If a product has been around for a while and still has a high demand, it is likely a good product.

(3) Material

Diesel Diagnostic Tools materials differ from manufacturer to manufacturer. Consider where and how you will be using your Diesel Diagnostic Tools to determine if one material would be better than another.

(4) Size

Like most products, Diesel Diagnostic Toolss come in various sizes. Do you need a large Diesel Diagnostic Toolsor a small one? Think about where you will use your Diesel Diagnostic Tools in order to determine the best size. You can also read the customer reviews on Amazon to see what others are saying about the size of the unit they purchased.

(5) Color

Diesel Diagnostic Toolss also come in a variety of colors. Do you need a particular color? You should also consider whether the color of your Diesel Diagnostic Tools would have any effect on the efficiency of its operation.

(6) Durability

The durability of an Diesel Diagnostic Tools will be contingent on the materials used as well as the quality of the manufacturing process. Additionally, the type of Diesel Diagnostic Tools you purchase may affect its durability.

(7) Storage

Will you need to store your Diesel Diagnostic Tools? If so, you should consider the size and weight of the Diesel Diagnostic Toolsto make sure that it can be stored properly. Also, give some consideration to the type of climate in which your Diesel Diagnostic Tools will be stored.

(8) Customer Ratings

Customer rating is one of the best criteria for choosing an Diesel Diagnostic Tools. It is hard to know exactly how an Diesel Diagnostic Tools will perform until you get it home and try it out.

(9) Warranty

Make sure the Diesel Diagnostic Tools you are considering is backed by a good manufacturer’s warranty. If it isn’t, you might be better off with another ones.