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Vito 3.0 cdi throws fault code p0473 when hot. Suspicion…

Customer Question
Vito 3.0 cdi throws...

Vito 3.0 cdi throws fault code p0473 when hot. Suspicion points towards faulty back pressure sensor or boost actuator. Pulls like a train but after a stop it seems like something is soaked with heat and malfunctions.

Mechanic's Assistant: Which particular sensor are you asking about? And have any trouble codes been triggered?

P0374 and exhaust pressure sensor

Mechanic's Assistant: What is the model/year of your Mercedes?

W638 3.0cdi 2007

Mechanic's Assistant: Are you fixing your vehicle yourself? What have you tried so far?

Fixin it myself

Mechanic's Assistant: Anything else you want the mechanic to know before I connect you?

Egr changed and exhaust differential pressure sensor (for dpf) changed quite recently

Submitted: 10 months ago.Category: Mercedes
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Answered in 1 hour by:
10/6/2017
Mercedes Mechanic: Merc320, Technician replied 10 months ago
Merc320
Merc320, Technician
Category: Mercedes
Satisfied Customers: 358
Experience: City & guilds pt 1 & 2
Verified

Hi my name is ***** ***** am here to assist you.

The boost pressure sensor is in the intercooler hose. Have you checked intercooler for leaks or split hoses.

Please keep me informed.

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Customer reply replied 10 months ago
Fault code p0473 exhaust pressure sensor A circuit high and limp mode. Takes a restart to get out of limp mode. Works fine until really hot, highway driving and then idle for a while. After that it throws code and limp mode after first time full boost.
Customer reply replied 10 months ago
Pressure sensor located on drivers side from turbo
Mercedes Mechanic: Merc320, Technician replied 10 months ago

Yes sensor on drivers side.

Can you here a hiss when accelerating ??

If you can then check turbo and intercooler hoses for splits and leaks.

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Customer reply replied 10 months ago
Not much help. Turned out to be a broken connection inside turbo actuator.
Mercedes Mechanic: Merc320, Technician replied 10 months ago

It is difficult when we cant hear or see the vehicle.

So glad you have sorted it.

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