AdBlue Reducing Agent Injector Metering Line for VW Passat B8, Arteon, Skoda Superb | OEM 3Q0131984AD, 3Q0131984AC

The AdBlue Injector Metering Line – OEM 3Q0131984AD is a precision-engineered AdBlue (urea reducing agent) metering/supply pipe designed for the Selective Catalytic Reduction (SCR) emissions system on diesel vehicles such as VW Passat B8, VW Arteon and Škoda Superb with 1.6 TDI and 2.0 TDI engines. This metering line carries AdBlue fluid from the dosing module to the AdBlue injector, ensuring the correct amount of reductant is delivered into the exhaust stream to neutralise nitrogen oxides (NOx) and meet emissions standards. A properly functioning metering line is essential for accurate AdBlue delivery and to avoid SCR faults, warning lights and reduced engine performance.

OEM Number: 3Q0131984R, 3Q0131983F, 3Q0131984AD, 3Q0131984AC, 3Q0131984AE, 3Q0131983AA, 3Q0131984AF

Quantity: 1

Our SKU: TVW3Q0131984AD_94

All our Reducing Agent Injector Metering Lines are OEM quality and reliable after-market car parts. This Reducing Agent Injector Metering Line is specifically compatible with Skoda: Superb, VW: Arteon, Passat, and Passat Alltrack.

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part with your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

Key Benefits

• OEM-Referenced Fit: Designed to match part number 3Q0131984AD (also related to 3Q0131984AC/AE/R) for direct replacement in SCR systems on compatible VW Group diesel cars.

• Ensures Accurate AdBlue Delivery: Delivers the correct volume of AdBlue reducing agent to the SCR injector, helping the engine control unit maintain optimal NOx reduction and comply with emissions regulations.

• Sticky Seals & Leak Resistance: Built to maintain a reliable fluid path under high temperature and vibration conditions, preventing leaks that can trigger emissions warnings.

• Restores SCR Functionality: When the metering line becomes blocked, cracked or degraded, it can affect AdBlue dosing accuracy — replacing it helps restore proper SCR performance and avoid engine emissions fault codes.

• Wide Vehicle Compatibility: Commonly fitted to diesel variants of the VW Passat B8 (estate & saloon), VW Arteon, and Škoda Superb (estate & hatch) from approximately 2014–2024 with SCR engines — always check fitment.

Frequently Asked Questions (FAQs)

Q1: What is an AdBlue injector metering line?
A: It’s a specially designed pipeline that carries AdBlue/urea reducing agent from the dosing system to the SCR injector. This fluid mixes into the exhaust where it helps chemically reduce NOx emissions before release into the atmosphere.

Q2: Why is this metering line important?
A: The SCR system relies on precise delivery of AdBlue; a blocked or leaking metering line can cause fault codes, emissions warnings, rough running or reduced engine power due to inaccurate dosing or SCR malfunction.

Q3: Which vehicles use part number 3Q0131984AD?
A: This line is typically used on VW Passat B8, VW Arteon and Škoda Superb models equipped with AdBlue SCR — for many 1.6 TDI and 2.0 TDI diesel engines produced from around 2014 through 2024.

Q4: What are signs this part needs replacing?
A: Symptoms may include AdBlue warning lights, emissions fault codes (e.g., low reductant flow), loss of SCR function or even limp mode — often caused when the line is blocked, cracked or leaking.

Q5: Is this a difficult part to replace?
A: Replacing the metering line generally requires access to the AdBlue dosing module/exhaust area and care to prevent contamination. Professional installation is often recommended to ensure no leaks and correct SCR system calibration.