Test Requirements

The fuses OK.
Battery voltage at least 12.5 volts.
All electrical consumers such as, lights and rear window defroster, switched off.
On vehicles with automatic transmission, selector lever in position "P" or "N".
A/C switched off.
Ground connections between engine/transmission/chassis OK.
Switch the ignition Off.

NOTE:

The reducing agent AdBlue® can irritate skin, eyes and possibly the respiratory system. If the fluid comes into contact with skin, rinse the affected area with plenty of water. Consult a physician if necessary.

The Reducing Agent Pump -V437- / Reducing Agent Pump Heater -Z103-, are a combined unit and are serviced as an assembly.

-- Remove the Reducing Agent Tank Assembly. The assembly is located above the rear muffler, mounted under the spare tire well, protected by a metal shield. Refer to the Repair Information for location and removal instructions.