Purity

Assuring the purity of DEF is particularly important with respect to avoiding malfunctions in the exhaust gas aftertreatment system.

If DEF is pumped out of the DEF tank, e.g. during repair work, it must not be returned to the tank. The purity of the fluid can no longer be guaranteed.

service products, cleaning agents or dust) Impurities in DEF (e.g. due to other service products, cleaning agents or dust) lead to:
• increased emission values
• damage to the catalytic converter
• engine damage
• malfunctions in the BlueTEC exhaust gas aftertreatment system

    See also:

    Problems with the transmission
    Problem Possible causes/consequences and - Solutions The transmission has problems shifting gear. The transmission is losing oil. •► Have the transmission checked at ...

    Driving with summer tires
    At temperatures below 45 °F (+7 °C), the elasticity of summer tires and therefore also traction and braking capability are reduced considerably — equip your vehicle with M+S tires. Using summe ...

    Detaching and storing the cargo net
    ► Detach guide rod ; from bracket 1. ► Press the red button on the upper and lower guide rods. ► Fold the cargo net and roll it up. ► Close the two Velcro fastene ...