DIESEL EXHAUST FLUID (DEF)
DIESEL ENGINES AND SELECTIVE CATALYTIC REDUCTION: WHAT IS DEF, HOW TO REFILL AND FAQs
We explain what emissions legislation means for our cars, our drivers and the environment.
WHAT IS DIESEL EXHAUST FLUID (DEF)?
DEF, also known as AdBlue®, AUS 32 and ARLA 32, is a non-toxic, colourless, odourless and non-flammable fluid. Stored in a dedicated tank in your car, DEF is injected into the exhaust system to clean exhaust gases. It breaks down nitrogen oxide (NOx) emissions into harmless water vapour and nitrogen gas.
HOW WILL I KNOW IF MY DEF LEVELS ARE LOW?
The message centre displays a series of messages when the DEF level becomes low.
1. The first message states that the DEF level is at a level where a top up is advised
2. The second message is accompanied by an AMBER warning icon and states to refill the DEF tank
3. The third message starts a countdown of the distance remaining until the DEF tank is empty, after which the vehicle will fail to start
4. The final message is accompanied by a RED warning icon and is displayed when the distance remaining is zero and states that no further restarts will be possible until DEF is added to the tank
NOTE: When the DEF level becomes low, a notification message displays in the message centre. Refill the DEF tank at the earliest opportunity. A Jaguar Retailer/Authorised Repairer can be contacted to arrange a full DEF refill. If required, DEF can be topped up using non-drip refill bottles available from a Jaguar Retailer/Authorised Repairer. An average consumption of DEF is 800km/1 litre. However, consumption can vary greatly depending on your driving style, the weather and the condition of the road.
It’s important that your Jaguar’s supply of DEF is maintained, as EU legislation means that you cannot start the engine without it. Your car’s message centre will give you advance warning when your DEF level is low and will alert you in plenty of time to book a refill. Your local Jaguar Retailer/Authorised Repairer will also refill the tank as part of your scheduled maintenance. Please refer to your Owner's Handbook for more information.
HOW TO REFILL YOUR AdBlue® TANK
FREQUENTLY ASKED QUESTIONS
WHAT IS EMISSIONS LEGISLATION?
Emissions legislation is aimed at making cars more environmentally friendly by limiting their exhaust emissions.
Jaguar offers the most capable vehicles appropriate for local conditions. For diesel, we offer the system known as ‘selective catalytic reduction’. It helps us achieve the lowest possible emission levels whilst maintaining good behaviour in other areas, such as refinement and fuel consumption.
This uses an additive to assist tailpipe emission control; it’s known as ‘diesel exhaust fluid’, or DEF.
WHAT IS SELECTIVE CATALYTIC REDUCTION (SCR) TECHNOLOGY?
Selective Catalytic Reduction (SCR) technology is fitted to all Jaguar diesel vehicles from 2016 Model Year. It enables Jaguar to meet local emissions legislation by reducing the levels of nitrogen oxide (NOx) emitted from the exhaust system by up to 90%. In addition to a new generation of catalytic converter, SCR Technology requires the use of Diesel Exhaust Fluid (DEF).