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DIESEL EXHAUST FLUID (DEF)

WARNING

DEF must be kept out of children's reach, to avoid serious injury or death.

WARNING

Read the label for safety precautions when using DEF, to avoid injury.

CAUTION

DEF must be stored in the original container, in a cool, dry, and well-ventilated area. Observe the manufacturer's storage and handling recommendations.

CAUTION

DEF has a strong odour and can stain clothing or upholstery. Take care not to spill the fluid when performing a top-up procedure. In the event of spillage, rinse immediately with clean water.

CAUTION

When refilling, make sure that the correct specification of DEF is used. Use of the incorrect fluid can result in serious damage to the vehicle. In this situation, do not start the engine, contact a retailer/authorised repairer immediately.

NOTES

Do not overfill the DEF tank.

NOTES

Do not use commercial vehicle DEF dispensing nozzles. The vehicle's DEF system is not designed to be refilled under these higher pressures.

Vehicles with a diesel engine may have a tank containing Diesel Exhaust Fluid (DEF). DEF is used to make sure that correct exhaust emissions are achieved. DEF is also known as AdBlue™, AUS 32, and ARLA 32. AdBlue™ is a trademark of the Verband der Automobilindustrie e.V. (VDA).

Dependent on the current geographical location, correct use of the DEF system may be a legal requirement. Running the vehicle without the correct specification of DEF may be a criminal offence. Always use the correct DEF specification, and the correct quantity of DEF. See LUBRICANTS AND FLUIDS, and also see CAPACITIES.

The consumption of DEF can vary greatly. An average consumption rate can be 800 km (500 miles) / 1 Litre, but this consumption rate can be more than doubled, depending on the driving style, road and weather conditions.

The distance until the DEF tank is empty and the volume of DEF required for refill can be viewed in the instrument panel as follows:

  1. Switch on the ignition. See SWITCHING ON THE IGNITION.

  2. Press the MENU button on the steering wheel control.

  3. Use the steering wheel control to navigate to highlight Vehicle info.

  4. Press the OK button to confirm selection.

  5. Scroll down to highlight Next service.

  6. Press the OK button to confirm selection. The Diesel Exhaust Fluid range and refill volume is displayed.

The instrument panel displays a series of messages when the DEF level becomes low, the volume of DEF required for refill also accompanies each message:

  • The first message states that the DEF level is at a level where a top up is advised.

  • The second message is accompanied by an AMBER warning icon and states to refill the DEF tank.

  • The third message starts a countdown of the distance remaining until the DEF tank is empty. After the countdown, vehicle start is inhibited.

  • 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 are possible until DEF is added to the tank.

To perform a full DEF system refill, it is recommended to contact a retailer/authorised repairer. If required, DEF can be added to the tank by following the top-up procedure.

The volume of DEF required to top-up or restart the engine is displayed in the instrument panel.

To perform a DEF top-up procedure, locate the DEF filler. See FLUID FILLER LOCATIONS.

Then, follow the steps below:

  1. Turn the tank filler cap counterclockwise to remove.

  2. Making sure not to exceed the required volume, top-up the tank following the instructions given on the DEF container.

    NOTES

    Non-drip bottles are the recommended method for top-up.

  3. Replace the tank filler cap and continually turn clockwise until hand tight.

If a DEF warning lamp, or message illuminates with a red warning icon, seek qualified assistance at the earliest opportunity. The possible events for this include DEF system malfunctions, incorrect fluid, and fluid quality. See DIESEL EXHAUST FLUID (DEF) (RED), and also see DIESEL EXHAUST FLUID (DEF) (AMBER).

NOTES

In extremely low temperatures below -10°C, DEF may freeze in the tank, making refilling difficult. Move the vehicle into a warmer environment, e.g., a garage. Raise the ambient temperature, in order to thaw the DEF, before attempting to top-up. In these conditions, it may take up to 1 hour of driving before the low DEF message extinguishes.

NOTES

When starting and stopping the engine, operation of the DEF pumps may be heard, but this is no cause for concern.

NOTES

The check engine (amber) warning lamp may illuminate after a refill. In this event, start the engine, run for approximately 30 seconds, and then switch off the engine. Do this three times in succession.