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2012 ML350 Bluetec RPM will not exceed 1200. Coded P0234

Customer Question
(overboost) & P0471 (exhaust pressure)...
2012 ML350 Bluetec RPM will not exceed 1200. Coded P0234 (overboost) & P0471 (exhaust pressure)
Submitted: 1 year ago.Category: Mercedes
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Answered in 21 minutes by:
12/15/2015
Mercedes Mechanic: JACUSTOMER-n3f1w267-,
 replied 1 year ago
JACUSTOMER-n3f1w267-
Category: Mercedes
Satisfied Customers: 1
Experience: shop foreman at Garage Denis Boisclair
Verified

Hi my name is ***** ***** I'll try my best to help you! What's the millage on the car?

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Customer reply replied 1 year ago
2012
Customer reply replied 1 year ago
I should add that we restarted a couple of times and it seemed to reset and perform fine. After some shutdowns no change.
Mercedes Mechanic: JACUSTOMER-n3f1w267-,
 replied 1 year ago

The exhaust sensor itself could be the problem , can you read the value of the sensor with a scan tool ?

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Customer reply replied 1 year ago
Have both parts on order. will replace exhaust sensor and both boost sensors. let you know if need to go further. I can read ohms on the exhaust sensor...if need be
Mercedes Mechanic: JACUSTOMER-n3f1w267-,
 replied 1 year ago

perfect ! change parts and clear faults . Cycle the key and wait 30 seconds .they can be tricky sometimes !

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Mercedes Mechanic: JACUSTOMER-n3f1w267-,
 replied 1 year ago

but first change the pressure sensor first . you could save money by returning the other parts .

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Customer reply replied 1 year ago
Replaced boost sensor and exhaust sensor...essentially same problem. Disconnected battery to reset..no go. Engine wont rev above 1300 when leaving 3rd gear. Shut down engine and engaging paddles and can turn 4,000 as soon as speed gets past 3rd gear, rpm drops. Codes are now P0402, P0234 7 P006D.
Customer reply replied 1 year ago
Also observed no "O" ring in the intake tube to the turbo... I mean gone. installed new o ring and replaced gaskets on mass airflow housing.
Customer reply replied 1 year ago
oh, mileage 55,000
Mercedes Mechanic: JACUSTOMER-n3f1w267-,
 replied 1 year ago

The orange o-ring is not in place !?

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Mercedes Mechanic: JACUSTOMER-n3f1w267-,
 replied 1 year ago

after you changed the o-ring , no change !?

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Customer reply replied 1 year ago
no change.
Mercedes Mechanic: JACUSTOMER-n3f1w267-,
 replied 1 year ago

Ummm , we have a really strange problem .... Can you provide me a picture of the pressure sensor ? The engine goes in over boost to protect itself and shut the turbo down . So once we get the pressure sensor to work correctly it will boost as normal ... If you remove the inlet tube from the turbo , can you turn the turbo with your finger ? Can you provide me a picture of the sensors you have change? We will make it work don't worry but those engines are pretty complicated and there's a lot of pieces who works together , so we need to go by elimination !

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