Remove/install a pressure sensor - AR07.04-P-0050MT

ENGINE 133 in MODEL 117, 156, 176 

ENGINE 270 in MODEL 117, 156, 176, 242, 246.2 

Shown on engine 270 

Fig 1: Pressure Sensor Remove/Install Components - Shown On Engine 270

Courtesy of MERCEDES-BENZ USA

	Risk of explosion  caused by fuel igniting, risk of poisoning caused by inhaling and swallowing fuel as well as risk of injury to eyes and skin caused by contact with fuel.	No fires, sparks, open flames or smoking. Pour fuels into suitable and appropriately marked containers only. Wear protective clothing when handling fuel.	AS47.00-Z-0001-01A
	General information on work on gasoline direct injection system		AH07.00-P-2000-01A
	Remove/install
1	Switch off ignition
2	Detach ground line from battery		AR54.10-P-0003NKB
3	Remove front engine cover (1)
4	Unclip purge lines at bracket for the coolant expansion reservoir from low-temperature circuit and place to one side	ENGINE 133 in MODEL 117, 156, 176 Do not bend the purge lines too strongly. These can break and must be replaced otherwise.
5	Detach partial load purge valve at bracket of the low-temperature circuit coolant expansion reservoir	ENGINE 133 in MODEL 117, 156, 176 Check retaining rubber from partial load purge valve for damage and replace if necessary.
6	Detach coolant expansion reservoir for low-temperature circuit with bracket from cylinder head cover and place to one side with attached lines	ENGINE 133 in MODEL 117, 156, 176
			AR20.30-P-4951MTA
7	Disconnect electrical connection (2) on pressure and fuel temperature sensor (B4/25)
	Clean
8	Clean rail (3) in the area of the fuel pressure and temperature sensor (B4/25)	Assembly cleaner	*BR00.45-Z-1028-04A
9	Remove pressure and fuel temperature sensor (B4/25) from rail (3)		AR07.03-P-1460-02MM
		Absolutely ensure to observe procedure in the referenced document for dissipating the fuel pressure. The fuel pressure and temperature sensor (B4/25) must be replaced after every disassembly.
		Pressure and temperature sensor to fuel distributor	*BA07.04-P-1001-01N
10	Install in the reverse order
11	Read out fault memory using the diagnostic system and delete
			AD00.00-P-2000-04A
	Risk of accident  from vehicle starting off by itself when engine running. Risk of injury  (bruises and burns) resulting from working on the engine while it is being started or when it is running.	Secure vehicle to prevent it from starting off by itself. Wear closed and snug-fitting work clothes. Do not touch hot or rotating parts.	AS00.00-Z-0005-01A
12	Check fuel system for leaks with engine running