Skip to main contentAccessibility help
Accessibility feedback
Press / to jump to the search box
Choose what you’re giving feedback on
  • Delete
  • See more
  • Delete
    • See more
    • Report inappropriate predictions
    Quick Settings
    Sign in
    AI Mode
    All
    Shopping
    Images
    Videos
    Forums
    Short videos
    More
    Web
    News
    Books
    Maps
    Tools

    Search Results

    Any time
    Any time
    Past hour
    Past 24 hours
    Past week
    Past month
    Past year
    Custom range...
    Custom date range
    Go
    All results
    All results
    Verbatim
    Advanced Search
    About 883,000 results (0.26s) 
    Ctrl+Shift+X to select

    Refine results

    • Category
      • Utility Pumps
      • Vehicle Fuel Injectors
      • Vehicle Diagnostic Tools
    • Stores
      • Walmart
      • Sail Teknoloji
      • eBay
    • Price
      • Under $100
      • $100 - $300
      • Over $300
      • $
        Please provide a valid price.
        $
        Please provide a valid price.
    • Sort by
      • Price: low to high
      • Price: high to low
    • Color
      • Blue
      • Black
      • Gray
    • Free shipping
      • Free shipping
    • Brand
      • BMW
      • John Deere
      • Mitsubishi
      • Ford
      See more
    Failed to load more results. Please try again later.
    Nearby
    Utility Pumps
    Reviews
    Buy
    For Sale
    Vehicle Fuel Injectors
    Walmart
    Location
    Under $100
    Blue
    Replacement
    Vehicle Diagnostic Tools
    Usa
    Black
    Gray
    New
    Used
    Small business
    Free shipping
    BMW
    Sail Teknoloji
    eBay
    An AI Overview is not available for this searchCan't generate an AI overview right now. Try again later.
    AI Overview
    Selective Catalytic Reduction ( SCR ) System AdBlue ...
    Selective Catalytic Reduction (SCR) systems use Diesel Exhaust Fluid (DEF), branded as AdBlue in Europe, to reduce harmful nitrogen oxide (
    NOxcap N cap O sub x
    𝑁𝑂𝑥
    ) emissions from diesel engines by converting them into harmless nitrogen and water. This urea-based solution is injected into the exhaust stream and is essential for meeting modern Euro 6 and EPA emissions standards. 
    Key Aspects of SCR and AdBlue/DEF Systems 
    • Composition: AdBlue/DEF consists of 32.5% high-purity urea and 67.5% deionized water.
    • How it Works: The SCR catalyst converts
      NOxcap N cap O sub x
      𝑁𝑂𝑥
       from exhaust into nitrogen (
      N2cap N sub 2
      𝑁2
      ) and water vapor (
      H2Ocap H sub 2 cap O
      𝐻2𝑂
      ).
    • Consumption Rate: Typically, AdBlue consumption is 3-5% of diesel consumption, or roughly 1.5 liters per 650 miles.
    • Storage: It is stored in a separate tank, not mixed with diesel fuel.
    • Maintenance: Over time, crystallization can occur, requiring maintenance. Products like Rislone DEF Crystal Clean can help prevent injector or pump blockages. 
    Common Issues 
    • Freezing: AdBlue freezes at roughly -11°C, though the system is designed to handle this.
    • Crystallization: Deposits can clog the system if the vehicle is inactive or used at low loads frequently.
    • Warnings: Failure to refill the DEF tank will result in reduced engine power (limp mode) or failure to start. 
    Components 
    • DEF Tank: Holds the urea solution.
    • Dosing Module: A pump that delivers exact amounts of DEF into the exhaust (e.g., Bosch 4387304).
    • SCR Catalyst: The chamber where the chemical reaction occurs. 
    • Rislone CRYSTAL CLEAN™ Diesel DEF/AdBlue & SCR ...
      Oct 21, 2024 — the selective catalyst reduction system or SCR injects diesel exhaust fluid or deaf into the hot exhaust stream and filters it thr...
      1m
      YouTube·Rislone
    • TotalEnergies - AdBlue® and SCR 3D video
      Apr 11, 2022 — combined with STR. technology AdBlue transforms the nitrogen oxides NOOX emitted by the diesel engine into nitrogen. and water vap...
      1:01
      YouTube·TotalEnergies
    • Diesel exhaust fluid - Wikipedia
      Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue) is a liquid used to reduce the amount of air pol...
      Wikipedia
    Show all
    • Rislone CRYSTAL CLEAN™ Diesel DEF/AdBlue & SCR ...
      Oct 21, 2024 — the selective catalyst reduction system or SCR injects diesel exhaust fluid or deaf into the hot exhaust stream and filters it thr...
      1m
      YouTube·Rislone
    • TotalEnergies - AdBlue® and SCR 3D video
      Apr 11, 2022 — combined with STR. technology AdBlue transforms the nitrogen oxides NOOX emitted by the diesel engine into nitrogen. and water vap...
      1:01
      YouTube·TotalEnergies
    • Diesel exhaust fluid - Wikipedia
      Diesel exhaust fluid (DEF; also known as AUS 32 and sometimes marketed as AdBlue) is a liquid used to reduce the amount of air pol...
      Wikipedia
    • SCR system and AdBlue FAQ's answered | Forté
      Let's start off simple with what the SCR system and AdBlue are. What is SCR – Selective Catalytic Reduction? Selective Catalytic R...
      Forté Lubricants
    • Selective Catalyst Reduction (SCR)
      SCR technology works by injecting a liquid-reductant agent through a special catalyst into the exhaust stream of the vehicle. This...
      BM Catalysts
    • What is AdBlue? Why does your car need it? | RAC Drive
      Feb 25, 2026 — AdBlue is diesel exhaust fluid that is designed to help vehicles meet the latest Euro emission standards. It is commonly found in ...
      RAC
    • The AdBlue you should use to prevent a breakdown.
      Apr 12, 2026 — introduction The class develops the AdBlue. you should use to avoid repairs on a diesel vehicle. as well as the implications for f...
      9:06
      YouTube·ADVANCED FLEET MANAGEMENT TUBE
    • Go to product viewer dialog for this item.
      Rislone DEF Crystal Clean Diesel DEF & SCR Emissions System Cleaner
      RISLONE DEF CRYSTAL CLEAN Diesel DEF & SCR Emissions System Cleaner is a propriety blend of DEF (Diesel Exhaust Fluid) / AdBlue co...
      Google
    • Go to product viewer dialog for this item.
      4387304 Bosch DEF Supply Dosing Module for SCR System
      Bosch 4387304 DEF Supply / Dosing Module Maintain emissions compliance and engine performance with this Bosch DEF dosing module, d...
      Google
    • Go to product viewer dialog for this item.
      5801863567 4508101 0444110005 – Module AdBlue SCR Bosch 12V FPT CNH
      5801863567 / 4508101 / 0444110005 – Bosch 12V SCR AdBlue Module FPT CNH 5801863567 / 4508101 / 0444110005 is an original Bosch 12V...
      Google
    AI can make mistakes, so double-check responses
    Share
    Facebook
    WhatsApp
    X
    Email
    Click to copy link
    Share link
    Link copied
    Thank you
    Your feedback helps Google improve. See our Privacy Policy.
    Share more feedback
    Report a problem
    Close
    Thank you
    Your feedback helps Google improve. See our Privacy Policy.
    Share more feedback
    Report a problem
    Close
    Thank you
    Your feedback helps Google improve. See our Privacy Policy.
    Share more feedback
    Report a problem
    Close
    Show more
    My Ad Center
    Videos
    How does the Adblue SCR DEF system work? Explained ...
    YouTube · GarageTech
    Jan 21, 2018
    YouTube · GarageTech
    7:38
    AdBlue, or DEF, is a deionized water and urea solution that reduces NOx emissions by converting them into nitrogen and water.
    GarageTech
    YouTube·
    Jan 21, 2018

    How does the Adblue SCR DEF system work? Explained ...

    YouTube·GarageTech·Jan 21, 2018
    YouTube
    In this video
    • 00:07
      Intro
    • 00:18
      What is NOx?
    • 00:47
      How does the AdBlue system work?
    • 01:25
      How does the NOx oxidation catalyst work?
    • 01:57
      How does the DPF catalyst work?
    • 03:33
      Ammonia injection
    • 03:48
      What is AdBlue
    • 04:17
      Adblue tank
    • 05:29
      AdBlue Pump
    • 07:15
      Ammonia conversion
    The Truth About AdBlue, DEF, and SCR Technology
    YouTube · Ben Johnson Automotive Fault Finding
    May 22, 2024
    YouTube · Ben Johnson Automotive Fault Finding
    14:46
    This video will explain how and why ad blue low efficiency fault codes occur and how to stop them from returning.
    Ben Johnson Automotive Fault Finding
    YouTube·
    May 22, 2024

    The Truth About AdBlue, DEF, and SCR Technology

    YouTube·Ben Johnson Automotive Fault Finding·May 22, 2024
    YouTube
    In this video
    • 00:00
      Introduction
    • 00:57
      What is SCR? What is NOx?
    • 01:21
      What is AdBlue?
    • 02:12
      What are the SCR components?
    • 02:58
      SCR unit functions
    • 03:38
      DDE functions
    • 04:10
      The SCR active tank
    • 05:01
      The metering valve
    • 05:54
      The feed pipe
    • 06:19
      NTC temp sender
    • 07:30
      NOx sensors
    • 09:00
      Under car components layout
    • 09:31
      Checking AdBlue mixture with a refractometer
    • 09:44
      Common leak points
    • 10:16
      Metering valve crystallisation
    • 10:26
      Bulging metering valve body, spray pattern, and flow rate
    • 10:50
      Diagnosing the NOx concentration and why this may cause fault code for poor quality AdBlue detected
    • 12:44
      Swapping the front and rear NOx sensors around
    • 13:17
      Replacing the faulty NOx sensor
    • 13:33
      Conclusion and fault found
    Rislone CRYSTAL CLEAN™ Diesel DEF/AdBlue & SCR ...
    YouTube · Rislone
    Oct 21, 2024
    YouTube · Rislone
    4:24
    Rislone DEF Crystal Clean dissolves crystal deposits throughout the entire SCR system, including the tank, pump, lines, and injectors.
    Rislone
    YouTube·
    Oct 21, 2024

    Rislone CRYSTAL CLEAN™ Diesel DEF/AdBlue & SCR ...

    YouTube·Rislone·Oct 21, 2024
    YouTube
    View all
    People also ask
    Is SCR the same as DEF?
    SCR is an active emissions control system. Hot exhaust gases flow out of the engine and into the SCR system where aqueous urea (known as Diesel Exhaust Fluid, or DEF) is sprayed onto a special catalyst.

    Selective Catalytic Reduction (SCR) - Engine Technology Forum


    Engine Technology Forum
    https://enginetechforum.org › selective-catalytic-reductio...
    Engine Technology Forum
    https://enginetechforum.org › selective-catalytic-reductio...
    How much does it cost to refill AdBlue?
    At your local National branch, you can refill your AdBlue, up to 10L for a price of £27.99. If additional litres are required, there may be an added charge.

    AdBlue fuel additive Top-up - National Tyres


    National Tyres
    https://www.national.co.uk › adblue
    National Tyres
    https://www.national.co.uk › adblue
    Can you drive with SCR fault?
    While you can drive with an SCR fault — for a short while, at least — we don't recommend it. This issue may cause problems like reduced performance, enter into “limp mode” before complete engine shutdown. It is far better to take the vehicle to an experienced, qualified technician quickly.Sep 7, 2025

    How to Clean and Maintain a Diesel SCR System


    Hot Shot's Secret
    https://www.hotshotsecret.com › diesel-scr-maintenance
    Hot Shot's Secret
    https://www.hotshotsecret.com › diesel-scr-maintenance
    What is SCR and AdBlue?
    AdBlue is a diesel exhaust fluid (DEF) used in vehicles with Selective Catalytic Reduction (SCR) technology to prevent harmful gases from being released into the atmosphere. AdBlue is a 32,5 % solution of high-purity, synthetically manufactured urea in de-mineralized water.

    What is Adblue®?| Diesel Exhaust Fluid for Emissions - Yara


    Yara
    https://www.yara.com › industrial-nitrogen › what-is-A...
    Yara
    https://www.yara.com › industrial-nitrogen › what-is-A...

    Web results

    SCR System & DEF (AdBlue): How It Works and Remove ...


    dl.ge
    https://dl.ge › blog
    dl.ge
    https://dl.ge › blog
    Sep 22, 2025 — Learn how the SCR system and AdBlue work in trucks. Common faults, repair costs, and safe disable options like emulators and ECU tuning.

    Selective Catalyst Reduction (SCR)


    BM Catalysts
    https://bmcats.com › app › SCR-Tech-Poster-2022
    BM Catalysts
    https://bmcats.com › app › SCR-Tech-Poster-2022
    PDF
    SCR systems can be sensitive to contamination and plugging. Crystallised urea/DEF deposits have been known to build up on the surface of pipework or on the ...Read more
    1 page

    What is Adblue®?| Diesel Exhaust Fluid for Emissions


    Yara
    https://www.yara.com › industrial-nitrogen › what-is-A...
    Yara
    https://www.yara.com › industrial-nitrogen › what-is-A...
    What exactly does AdBlue do? AdBlue helps the SCR system turn harmful nitrogen oxides (NOx) into harmless nitrogen and water. · Is AdBlue mixed with diesel fuel?Read more

    How SCR Technology Works


    Guangzhou EverBlue Technology Co.,Ltd.
    http://www.everbluesolution.com › blog › how-scr-techn...
    Guangzhou EverBlue Technology Co.,Ltd.
    http://www.everbluesolution.com › blog › how-scr-techn...
    Apr 12, 2021 — AdBlue DEF is a consumable that must be used in SCR technology. SCR technology uses a catalyst system can effectively reduced the emission ...Read more

    Diesel exhaust fluid


    Wikipedia
    https://en.wikipedia.org › wiki › Diesel_exhaust_fluid
    Wikipedia
    https://en.wikipedia.org › wiki › Diesel_exhaust_fluid
    DEF is also sold as AdBlue, a registered trademark of the German Association of the Automotive Industry. Several brands of SCR systems use DEF: BlueHDI is ...Read more

    SCR system and AdBlue FAQ's answered


    Forté Lubricants
    https://www.forteuk.co.uk › News
    Forté Lubricants
    https://www.forteuk.co.uk › News
    Diesel Exhaust Fluid (DEF) or AdBlue is used to reduce harmful gases being released into the atmosphere. AdBlue is a 32.5% solution of high-purity, ...Read more

    Selective Catalytic Reduction ( SCR ) System AdBlue ...


    HSMAG Magnets
    https://www.hsmagnets.com › Automotive
    HSMAG Magnets
    https://www.hsmagnets.com › Automotive
    Jul 25, 2019 — SCR is short for Selective Catalytic Reduction, and SCR is a type of active emission control system for diesel powered car. Automotive-grade ...Read more

    Protecting Your SCR System - AdBlue DEF


    LinkedIn · Fleetguard Filters Pvt. Ltd.
    30+ reactions · 4 months ago
    LinkedIn · Fleetguard Filters Pvt. Ltd.
    30+ reactions · 4 months ago
    The urea transforms into ammonia, which then reacts with harmful nitrogen oxides (NOx) in the DEF SCR System. This process converts toxic NOx ...Read more
    Popular products
    • 10 in 1 Euro 5 Adblue (SCR) Emulator.
      10 in 1 Euro 5 Adblue (SCR) Emulator
      $39.00
      Can-Bus Emulator
      Free delivery on $79+
      10 in 1 Euro 5 Adblue (SCR) Emulator
      $39.00
      Can-Bus Emulator
      Free delivery on $79+
    • SCR Def AdBlue Delete Hand-held OBD Module for Sprinter.
      SCR Def AdBlue Delete Hand-held OBD Module for Sprinter
      $699.00
      OBDtune
      SCR Def AdBlue Delete Hand-held OBD Module for Sprinter
      $699.00
      OBDtune
    • SCR System Cleaner Protec.
      SCR System Cleaner Protec
      $23.59
      eBay - cs-parts-de       & more
      5.0(2)
      SCR System Cleaner Protec
      $23.59
      eBay - cs-parts-de       & more
      5.0(2)
    • Terex Euro 6 Adblue (SCR) Emulator.
      Terex Euro 6 Adblue (SCR) Emulator
      $149.00
      Can-Bus Emulator
      Free delivery
      Terex Euro 6 Adblue (SCR) Emulator
      $149.00
      Can-Bus Emulator
      Free delivery
    • Rislone DEF Crystal Clean Diesel DEF & SCR Emissions System Cleaner.
      Rislone DEF Crystal Clean Diesel DEF & SCR Emissions System Cleaner
      $24.99
      O'Reilly Auto Parts       & more
      Free delivery on $35+
      4.0(161)
      Rislone DEF Crystal Clean Diesel DEF & SCR Emissions System Cleaner
      $24.99
      O'Reilly Auto Parts       & more
      Free delivery on $35+
      4.0(161)
    • Dewulf Euro 6 Adblue (SCR) Emulator.
      Dewulf Euro 6 Adblue (SCR) Emulator
      $199.00
      Can-Bus Emulator
      Free delivery
      Dewulf Euro 6 Adblue (SCR) Emulator
      $199.00
      Can-Bus Emulator
      Free delivery
    • Detroit Truck Adblue (SCR) Emulator.
      Detroit Truck Adblue (SCR) Emulator
      $199.00
      Can-Bus Emulator
      Free delivery
      Detroit Truck Adblue (SCR) Emulator
      $199.00
      Can-Bus Emulator
      Free delivery
    • 4387304 Bosch DEF Supply Dosing Module for SCR System.
      4387304 Bosch DEF Supply Dosing Module for SCR System
      $875.00
      Midwest Bus Parts
      4387304 Bosch DEF Supply Dosing Module for SCR System
      $875.00
      Midwest Bus Parts

    Web results

    What is AdBlue? Why does your car need it?


    RAC
    https://www.rac.co.uk › ... › Emissions
    RAC
    https://www.rac.co.uk › ... › Emissions
    Feb 25, 2026 — AdBlue is typically used in diesel-powered vehicles that are equipped with a Selective Catalytic Reduction (SCR) system to reduce harmful ...Read more
  • What Is Adblue?
  • Adblue Dashboard Warning...
  • Adblue Faq
    • People also search for
    Scr system adblue def review
    Scr system adblue def vs adblue
    Scr system adblue def instructions
    How does AdBlue work
    What is AdBlue made of

    Page Navigation

    12345678910Next

    Footer Links

    90012, Los Angeles, CA
     - From your IP address
     - 
    Update location
    Can't update your location
    Learn more
    Updating location...
    HelpSend feedbackPrivacyTerms
    Google apps