Safety precautions when working on the SCR system

Risk of damage caused by reducing agent

If reducing agent gets onto trim panels and body components, the reducing agent may solidify after a while and thus damage the surface.

• Make sure that no reducing agent gets onto the trim panels or body components.
• If any reducing agent does get onto surfaces, remove it immediately using water and a cloth.

Risk of injury due to reducing agent

The reducing agent may cause eye and skin irritations as well as injuries to the respiratory system and poisoning.

• Wear protective goggles.
• Wear protective gloves.
• Always wear protective clothes.
• Make sure that a sufficient amount of fresh air is supplied. In closed areas, switch on the exhaust gas extractor system.

Risk due to escaping reducing agent:

• To prevent large amounts of reducing agent from escaping when the metering line is opened, it is necessary to wait until automatic return of the reducing agent is completed ⇒ 2.5 Safety precautions when working on the SCR system.

Automatic return of reducing agent

• After the ignition has been switched off, the reducing agent is returned from the metering line leading to the reducing agent injector - N474- back to the reducing agent tank.
• Before any work is done in this area, it is necessary to wait until all the reducing agent has been returned to the tank; this can take up to 10 minutes after the ignition is switched off.
• Similarly, it is not permissible to disconnect the battery until all the reducing agent has been returned to the tank, i.e. 10 minutes after the ignition is switched off ⇒ Electrical system; Rep. gr. 27; Battery; Disconnecting and connecting battery.