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Top 10 Best Automotive Emission Analyzer of (2024) Review

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    We trust our cars to the mechanics and repairing specialists, but we never think what would have happened if they’d used different kind emission analyzer. Best OBD II scanners have increased “abilities” which provides extra and super fast problem diagnose and solving ways. And faster we can repair our car – faster we move forward. Sometimes the problem is not as grave as it seems at first look. Not every issue needs an electric welder or a cordless drill to be fixed. Sometimes the problem lies in the program of the car so just a diagnostic scanner is enough for repairs.

    Typically, the analyzer is simply plugged into the connector, the vehicle is powered on (but not started), and you follow the simple menu on the display to retrieve any diagnostic codes saved to the onboard computer. These codes remain in memory until the problem is fixed or they are deliberately cleared.

    Professional-level emission analyzers have much greater capabilities and require some training. Diagnostic technicians can do much more, such as perform specific bi-direction tests on running vehicles or connect to OEM-specific devices and controls to get feedback that won’t normally generate error codes.

    Below, we have reviewed the top ten rated car emission analyzer that you can get your hands on today, along with detailed breakdowns of all the features and unique selling points of each OBD2 scan tools.

    List of the Best Automotive Emission Analyzer of 2024:

    10. OTC UREA Diesel Exhaust Fluid (DEF) Refractometer

    OTC UREA Diesel Exhaust Fluid (DEF) Refractometer

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    The Refractometer is a portable, precision, optical instrument used for measuring the Diesel Exhaust Fluid (DEF) concentration. When a liquid UREA sample is placed on the prism, the light passing through it is bent. The more concentrated the liquid, the more the light will bend. The Refractometer contains a reticle, or scale, that is enlarged through the eyepiece to measure this light. The values on the scale have been established to evaluate the DEF condition. EPA regulations require all diesel engines manufactured on or after January 1, 2010 to meet lowered NOx emissions standards. Most heavy duty engine (Class 7-8 trucks) manufacturers, have chosen to utilize SCR. This Includes Detroit Diesel (DD13, DD15, and DD16 models), Cummins (ISX line), PACCAR, and Volvo/Mack. SCR-equipped engines require the periodic addition of Diesel Exhaust Fluid (DEF, a urea solution) to enable the process. DEF is available in a bottle from most truck stops, and some have installed bulk DEF dispensers near the Diesel Fuel pumps. However, to ensure the proper operation of the SCR system, operators must ensure the DEF in their vehicle consists of a 32.5 percentage Urea/Water solution. It makes this a simple and quick process for an operator or technician. The information of the scale is: 0.5 percentage, line graduations 32.5 percentage, indicated scale 15-40 percentage, waterline, and 20 degree Celsius kit includes Refractometer, dropper, lens wipe cloth, instructions and quick guide, screwdriver, and case.

    9. EXCOUP OBDII Protocol Detector and Breakout Box OBD Diagnostic tool

    EXCOUP OBDII Protocol Detector and Breakout Box OBD Diagnostic tool

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    OBD2 Breakout Box is used to change the pin settings of other diagnostic tools without the needs to cut the connecting cable for rewiring. Signal may not meet angle can take other signal transfer angle. Application is very convenient and solve risks across the line. OBD breakout box is mainly used for car OBD line signal judgment and signal transfer. Using car fault diagnosis instrument can quickly determine car OBD signal receiving. OBD diagnostic tool can monitor the OBD interface voltage and ground showed low voltage. Display diagnostic stitching error.

    You can also quickly switch between different terminals of your vehicle’s OBD socket when using beta software / hardware. This OBDII protocol detector has wide range of applications in diagnostics, key programming, and chip tuning. This OBDII Protocol Detector & Break Out Box has wide range of applications in diagnostics, key programming, and chip tuning. It can monitor data steam while performing test on vehicle using a scan tool. This makes it possible for you to both execute a test and simultaneously monitor the testing process while is playing testing voltage on the car or truck and communicating pin number. It also plays as an extension of OBD Diagnostic Link Connector (DLC).

    8. Autel MaxiDiag MD806

    Autel MaxiDiag MD806 OBD2 Scanner, ABS SRS Engine Transmission Four Systems Diagnostic Scan Tool...Check Price on

    One tool can do it all-reads and clears trouble codes on either the basic 4 systems ( Engine, Transmission, ABS, and airbag ) or all the systems, reads and clears trouble codes on engine, transmission, airbag, and ABS failures. Quick erase feature allows all codes to be cleared with the push of a button, Live data graphing for the ECU, and one button Auto-Scan reads codes in all modules and displays them on the screen. Autel’s Breakthrough Diagnostics Tool capable of accessing every module within each vehicle system, it is the combination of All Systems Access (Engine, Transmission, ABS, SRS…and more), OBDII Scanner, Oil Rest and EPB for the vehicle brand of the Users Choice.This device covers the vehicle from Nissan, For Infiniti, Toyota, Lexus, Scion, Honda, Acura, Subaru, Mitsubishi, Suzuki, Isuzu, Hyundai, Kia, Daewoo, Mazda, Holden, Benz, Smart, Sprinter, Maybach, BMW, Mini, VW, Seat, Skoda, Audi, Opel, Land Rover, Jaguar, Volvo, Porsche, Saab, EU, Vauxhall, GM, Chrysler, Peugeot, Renault, Dacia, Fiat, Abarth, Alfa-Romeo, Maserati, to Lancia.

    7. PLX Devices DM-6 SM-AFR Gen4 Gauge Combo UEGO AFR Air/fuel Ratio Bosch

    PLX Devices DM-6 SM-AFR Gen4 Gauge Combo UEGO AFR Air/fuel Ratio Bosch

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    The PLX Wideband AFR (UEGO) gauge combo combines an accurate, fast response wideband AFR (Air Fuel Ratio) controller with the world’s most advanced touch screen 2 1/16″ gauge (52mm). It includes a Bosch LSU4.9 wideband oxygen sensor. The wideband controller (SM-AFR) works with gasoline, biodiesel, ethanol, methanol, E85, LPG, and CNG. It includes two analog outputs (wideband 0-5V, and narrowband 0-1V) for interfacing with 3rd party devices and one digital serial output for interfacing with the DM-6 gauge and other Multi Gauges. The wideband analog output is ideal for interfacing with aftermarket ECU’s and data loggers. The narrowband output is ideal for stock narrowband oxygen sensor replacement where the simulated narrowband analog output is fed back into your ECU to make it operate as if the stock narrowband oxygen sensor is still installed while running the PLX wideband setup. All three outputs can be used simultaneously. Additional features include advanced soft start technology which prolongs the oxygen sensor life. Dasiy-chain up to 16 sensor modules in any combination. SM-AFR, SM-Vac/Boost, SM-EGT, SM-AIT, SM-FluidTemp, SM-FluidPressure. The DM-6 MultiGauge automatically detects the sensor modules and allows you to toggle through all of your sensors in plot, numeric, peak-hold views.

    6. Veepeak Mini Bluetooth OBD2 Scanner

    Veepeak Mini Bluetooth OBD II Scanner for Android ONLY, Auto Check Engine Light Code Reader Car...Check Price on

    With this device, you can find out why your check engine light is on before visiting the mechanic – save money by fixing simple problems yourself! Read diagnostic trouble codes, both generic and manufacturer-specific, and display their meaning (over 3000 generic code definitions in the database), clear trouble codes, turn off the MIL (“Check Engine” light) as well as display current sensor data. Simply plug the device in your car’s OBD2 port, turn on your car, enable WiFi on your phone or tablet, search for “Bluetooth_OBD2” and connect, run the download App with simple settings and wait until it connects your car’s ECU successfully. This app and system are compatible which include OBD Fusion, DashCommand, OBD Car Doctor (free), etc. on Apple Store for iPhone & iPad; Torque Pro, Torque Lite (free), OBD Car Doctor (free), etc. on Google Play for Android cellphone and table. Wide coverage is the core feature of this device. It works with all 1996 and newer vehicles located in USA that are OBD2 compliant including but not limited to Volkswagen, GM, Chevrolet, Honda, TOYOTA, Mazda, Ford, Dodge, Peugeot, Subaru, Citroen, BMW, Audi, Skoda, Subaru, Hyundai, Kia, Suzuki, Opel, Chrysler, Benz, Porsche, Renault, Fiat, Mitsubishi, Isuzu, Daihatsu, etc.

    5. Launch X431 PRO Mini Bi-Directional Full Systems Diagnostic Scan Tool

    LAUNCH X431 Pro Mini Elite 3.0(Same Function as X431 V) Bi-Directional Scan Tool,OE-Level Full...Check Price on

    Launch X431 is a specialized automotive diagnostic tool for resetting the automotive service lights, which is developed on the 6th generation CReader hardware platform. This product has applied the latest Cortex-M3 32-bit processor, 2.8″ color LCD display, which is smart, portable, and simple to use. After repaired and serviced the vehicle, the maintenance man can use it to clear or reset the warning lights on the instrument cluster to eliminate the unnecessary warning, which can make the car owners driven at ease. This device from LAUNCH is specially designed for functions like engine service light reset, steering light reset, brake pad reset. This device is specially designed keeping in mind small and roadside garage. This device comes with the screen of 2.8” with TFT 262K true color and 320*240 Pixels LCD display. The input voltage range is 8 ~ 32V while the operating current is less than 100 mA at 12V(Typical). The power consumption is less than 1.2 W with the link connection of Standard OBD 16-pin DLC. Outline dimension measures 121 * 82 * 26mm and weighs less than 500 g.

    4. OBD2 Scanner TOPDON TD309 Auto Fault Code Reader Car

    OBD2 Scanner TOPDON TD309 Auto Fault Code Reader Car

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    With wide vehicle coverage, this car code reader can be used to test on most 1996 US-based, 2000 EU-based and newer vehicles compatible with OBD2/EOBD protocols, only for minivans, SUVs and 12V light trucks. The I/M readiness check is helpful in indicating the running status of your vehicle components and you’re capable of easily figuring out whether your exhaust meets the emission standards and passes smog check. To achieve better using experience, this OBD2 scanner is designed with capability of quickly reading and clearing codes, turning off the check engine light, viewing freeze frame data, greatly saves time and money for your diagnoses. You are able to be more acquainted with your car via retrieving vehicle information (VIN/CIN/CVN) and you can also get definitions of trouble codes read from built-in DTC database. Durable buttons designed for convenient using is comfortable and easy to operate. Backlit color LCD screen with 220*176 definitions is specially featured for clear data viewing and protecting your eyes, even under direct sunlight. You can trust Topdon with this device since Topdon is a new company rising in the automotive aftermarket. Topdon is dedicated to product development and innovation with a special emphasis on the user experience. Their vehicle-industry experts and veteran engineers ensure that each product is well-designed and manufactured to the highest standards. Their experienced management team is committed to bringing you the best auto-care products at budget-friendly prices.

    3. Autophix OM121 Handheld Universal Automotive Can Diagnostic Scan Tool

    Autophix OM121 Handheld Universal Automotive Can Diagnostic Scan Tool

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    The car diagnostic scanner reads hard(memory)/pending(intermittent) and historic codes accurately and show the DTC definitions in multiple languages (English, German, French, Spanish). OM121 scanner is an ideal choice for the DIYER who looking to learn a little more about his car or truck inner workings. Although it’s a small OBD II reader, it does all the basic functions. This basic unit can read out and also delete generic OBD2 trouble codes. If you are a car technician, you will urgently need this tool to assist you to find the fault. OBDii vehicle diagnostic code reader works on 1996 and newer US-Built, EU-Built and Asian-Built OBD2 vehicles. This device comes with I/M monitor readiness test, and it can easily determine the cause of the Check Engine Light ( MIL), turns off the Check Engine Light and retrieves vehicle information (VIN, CIN and CVN). The external power ranges from 8.0 to 18.0V power provided via vehicle battery with the dimension of 4.25*2.91*0.79 Inch. Autophix present you with the best auto diagnostic scanner which will help you save money and accurately diagnose any car problem.

    2. Launch CRP123 OBD2 Scanner

    Launch CRP123 OBD2 Scanner

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    Launch CRP123 is an automotive diagnostic tool, mainly developed to test four major system: Engine, Transmission, Airbag (SRS) and Anti-lock Brake System (ABS). It features powerful diagnosing functions, such as reading, clearing DTCs and reading the real-time data streams. This OBD2 scanner does not only include OBD2/ OBD / EOBD standard protocol diagnosis, but also cover professional diagnostic software for multiple models which can perform comprehensive diagnosis on four main ECU’s (ENG\ABS\SRS\AT) of vehicles. The scan tool can support full OBDII functions such as:read/erase codes, I/M readiness,data stream, view freeze frame, O2 sensor test, on-board monitor test,EVAP system test,Vehicle information display(VIN CID CVN). Such a great plus, the code scanner can support Asian car models: Suzuki, Peugeot,Honda, Mitsubishi, Nissan, Toyota, Mazda, Hyundai, Kia, Subaru, Infiniti, Lexus, Acura, Isuzu. USA car models: Ford, GM, Chrysler. European car models: EU ford, Benz, BMW, VW, Opel, Volvo, Fiat, Land Rover, Seat, Skoda, Chevrolet, Citroen, Renault. This device is multilingual which can support multi-language, such as English, Spanish & French etc. The default language is English, you can select the ‘Setting’ in the main menu press ‘OK,’ the system will enter a screen, this option enables you to set the user interface language.

    1. Autel MaxiDiag Advanced MD808 (MD808 Pro)

    Autel MaxiDiag Advanced MD808 (MD808 Pro)

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    Autel is one of the leading developers, manufacturers, and distributors of professional automotive diagnostic tools, equipmen,t and accessories. Since its inception more than 10 years ago, Autel has been committed to producing some of the most leading edge tools; providing customers worldwide with enduring value. Large Color Screen/Push-button Navigation is compatible with domestic, Asian and European vehicles, 1996. It can access specific system to find faults, view Live and Freeze Frame Data or select AutoScan to diagnose all the available systems. Large Service Function Menu aids in performing the most popular maintenance services including oil light reset, electronic parking brake servicing, steering angle sensor reset, diesel particulate filter regen and battery maintenance service. Auto Vin and Auto Scan Functionality automatically identifies vehicle make, model and year to define vehicle-specific codes. Auto Scan function automatically scans all vehicle systems for codes and displays Pass/No Fault or Failed/Fault. This device has large service menu such as Oil and Maintenance Service Lights Resets, Steering Angle Sensor Reset, Battery Maintenance Services, Electronic Parking Brake Maintenance Services, Diesel Particulate Filter Regeneration. It can scan all available vehicle systems not just engine, ABS, SRS and Transmission.


    We hope with our buying guide and top ten, you are more confident in choosing the emission analyzer that fits your requirement. Each analyzer above shares similar features, but they do have their own specific potentials. Think wisely and feel free to go over each item again. Then click order now to present yourself with the best emission analyzers for your vehicles.

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