To help protect our environment, some Volkswagen TDI models are now fitted with AdBlue emissions control equipment which cleans exhaust gases helping cars to comply with the new EU6 exhaust emissions regulations.
AdBlue is a non-toxic, non-flammable; biodegradable urea and water-based liquid additive that processes the gases in a car exhaust system to remove harmful nitrogen oxide (NOx) emissions.
The AdBlue solution is stored in a tank positioned near the car’s conventional fuel tank, accessed through a cap usually found at the rear of the car; its location will depend on the model. The System works by injecting minute amounts of the solution into the exhaust system when the engine is running. The chemicals in AdBlue break down the polluting NOx emissions into harmless water vapour and nitrogen gas.
The size of the AdBlue tank fitted to your car will vary depending on which Volkswagen model you have, therefore the interval between top ups will vary. In addition many factors such as mileage covered, journey types, driving styles and environmental conditions can influence how much AdBlue is consumed. A passenger car will consume approximately 1.5 litres of AdBlue every 620 miles.
AdBlue belongs to the lowest water pollution hazard category but is a skin irritant and a corrosive liquid that can cause injury if it touches the skin, eyes or respiratory organs (see further advice below)
How do I know if my Volkswagen uses AdBlue?
A simple visual check will reveal if your car uses AdBlue
The AdBlue filler nozzle is located either next to the main diesel fuel cap (Passat) under your car’s filler flap (or in the boot on Touareg and Sharan) and looks like a smaller filler nozzle. Simply opening the filler flap will reveal the AdBlue nozzle (if fitted). The AdBlue cap is unscrewed either using the screw cap or using the car’s wheelbrace, which is found in the toolkit.
The Volkswagen low emission system
How AdBlue helps cut emissions
Reduced raw exhaust emissions are achieved in TDI engines equipped with AdBlue through a modified fuel injection system, exhaust gas recirculation and optimised turbocharging.
The Volkswagen low emission system uses a DeNOx catalyst, diesel particulate filter and injection of AdBlue
The AdBlue solution is stored separately from the fuel tank and is pumped in small quantities into the exhaust pipe ahead of the DeNOx catalyst when the engine is running.
The quantity of AdBlue injected depends on your driving style, engine loading and atmospheric conditions.
Refilling with AdBlue
How to replenish your AdBlue tank
A dash message will inform you if the AdBlue reservoir is running low (see below). It is important to note that the engine will not run if the AdBlue supply is exhausted. AdBlue consumption often increases when driving under load (exacerbated by high engine load driving or towing a trailer or caravan, for example), with the result that the low AdBlue message may deploy earlier than usual.
AdBlue top ups are available from your local Volkswagen retailer at a price of £1.50 per litre (this includes the AdBlue liquid, the labour to install it and VAT at the current rate). Retailers will refill AdBlue during vehicle servicing upon request.
Your Volkswagen authorised repairer can refill the AdBlue tank, and it is important to visit the workshop when the light comes on for the first time to avoid running out, whereupon the engine will not re-start.
Alternatively, you can self-refill the AdBlue tank with half-gallon (1.89 litres) refill containers of AdBlue, available from your Volkswagen authorised repairer and selected filling stations. Use only the AdBlue approved by Volkswagen in accordance with the Volkswagen standard and DIN 70070.
To refill the tank, a fill adaptor must be screwed onto the AdBlue refill container, which can then be screwed onto the filler neck of the AdBlue tank. By applying pressure to the bottle, the valve in the fill adaptor opens allowing the AdBlue to fill the tank.
The Volkswagen 1.89litre top-up comes complete with the adaptor, part number: G052910A2
Further advice
AdBlue needs to be handled with care
If handling AdBlue, wear suitable protective clothing such as rubber gloves and glasses.
If AdBlue comes into contact with eyes and skin, rinse for at least 15 minutes with plenty of water and seek medical help. If AdBlue is swallowed; wash the mouth with plenty of water for at least 15 minutes. Do not try to induce vomiting unless recommended by a doctor. Seek medical advice immediately.
AdBlue damages surfaces such as painted vehicle parts, plastic, items of clothing and carpets.
Spilt AdBlue should be removed as quickly as possible using a damp cloth and plenty of cold water.
If the mixture is spilt, wash the area immediately as it can be slippery and may cause structural or staining problems with brick or concrete surfaces.
To avoid contamination, do not reuse AdBlue which has previously been drained off.
Only fill the AdBlue tank using the Volkswagen approve tools and containers.
Keep all refilling equipment free of dirt and dust.
Avoid mixing AdBlue with diesel fuel, and do not use it if it is contaminated with water or fuel of any kind.