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:

    Maintenance
    The Service and Warranty Booklet describes all the necessary maintenance work which should be done at regular intervals. Always have the Service and Warranty Booklet with you when you bring the ...

    Fuse box in the cargo compartment
    ► Open the tailgate. ► To open: insert a suitable object, e.g. a coin, into the slot of release button 1 on the cover. ► Turn release button 1 90° in the direction of the ar ...

    Socket in the rear-compartment center console
    Example: vehicles with the smoker's package Lift up the cover of socket 1. ...