Remove/install SCR AdBlue combination sensor for fill level and temperature with integral AdBlue heat duct - AR14.40-P-2044GZB

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ENGINE 642 in MODEL 164, 166, 212, 218, 221, 251 with CODE U42 (BlueTEC diesel exhaust treatment (SCR))

ENGINE 651 in MODEL 166 with CODE U42 (BlueTEC diesel exhaust treatment (SCR))

Fig 1: SCR Adblue Combination Sensor Remove/Install Components (1 Of 2)

Courtesy of MERCEDES-BENZ USA

Fig 2: SCR Adblue Combination Sensor Remove/Install Components (2 Of 2)

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of burn injuries and scalding when working at AdBlue lines and the components attached to them. Risk of injury to skin and eyes when handling AdBlue. Risk of poisoning caused by swallowing AdBlue	Pour AdBlue into suitable containers only. Wait until the pressure is released before working on the exhaust aftertreatment system.	AS14.40-Z-0001-01A
	Notes on use, material properties and handling of AdBlue®		AH14.40-N-0001-01AB
1	Remove AdBlue® tank	MODEL 166 with ENGINE 642, 651 with CODE U42 (BlueTEC diesel exhaust treatment (SCR))	AR14.40-P-2014GQ
		MODEL 164, 251 with ENGINE 642 with CODE U42 (BlueTEC diesel exhaust treatment (SCR))	AR14.40-P-2014GZB
		MODEL 212, 218, 221 with ENGINE 642 with CODE U42 (BlueTEC diesel exhaust treatment (SCR))	AR14.40-P-2014OGE
2	Remove AdBlue® deliver module		AR14.40-P-2021GZB
3	Detach electrical connectors for heating element and fill level sensor	Unclip plug for heating element on AdBlue® container.
4	Remove union nut (2)	Union nut, delivery module to AdBlue tank	*BA14.40-P-1002-02A
5	Lift up cover of takeoff tank (4) with rubber seal (3) and fold over	First install rubber seal (3) into AdBlue® container. Note matching on arrow on cover and arrow on AdBlue® container.
6	Turn takeoff tank (4) counterclockwise	Turn takeoff tank (4) far enough in a clockwise direction until the takeoff tank (4) has latched completely into position.
7	Remove takeoff tank (4) from AdBlue® container
8	Install in the reverse order

EXHAUST AFTERTREATMENT, BLUE TEC

Number	Designation		ENGINE 642 with CODE U42	Engine 651 with code U42
BA14.40-P-1002-02A	Union nut, delivery module to AdBlue tank	Nm	85	85