Q: Engine fault reduced power

asked by on August 12, 2016

I have a BMW 320d E90 2011. The option was not showing up on the model type. I get an intermittent engine fault running on reduced power message. Took it to get diagnosed and the fault code DTC 4755 showed up mentioning boost pressure actuator. Position control. The mechanic mentioned that the drainage system was blocked and there was moisture in the ECU. Dried it out but the problem persists. Any advice please? 30000 kms not miles.

My car has 30000 miles.
My car has an automatic transmission.

It sounds like you could have a sticking boost pressure actuator. Unfortunately, YourMechanic does not work on your model vehicle. I suggest having the dealership take a look at it.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Car wont start. 2011 BMW 328xi

Hi - this "stalling and won't restart" problem could have several causes, so extracting the problem codes that turned on the "!" indicator is the first step. A failing fuel pump (fuse, relay or the pump itself), or a crankshaft...

2012 BMW 650i Malfunction displays, car shakes, loses power, can't accelerate, shuts down

Hi there, thanks for writing in about your 2013 BMW 650i. Your battery receives a charge voltage from the alternator while driving. The alternator is responsible for maintaining the charge on a battery during vehicle operation. Very low power can...

Why does the hood of my 2012 BMW 328i get really hot?

The engine compartment will get very hot when the engine is running and with the vehicle you have most of the heat is radiated out through the hood. If you feel your hood is getting hotter than it should be...

Related articles

P2125 OBD-II Trouble Code: Throttle/Pedal Position Sensor/Switch "E" Circuit
P2125 P2125 code definition P2125 is a general OBD-II trouble code indicating a fault with the throttle/pedal position sensor/switch “E” circuit. This code is similar to many other throttle body and pedal position codes. What the P2125 code means The...
P0346 OBD-II Trouble Code: Camshaft Position Sensor A Circuit Range/Performance (Bank 2)
P0346 P0346 code definition The appearance of the P0346 code indicates that the PCM has detected an incorrect voltage or waveform reading from the engine bank 2 camshaft sensor A camshaft position sensor circuit. What the P0346 code means The...
P0098 OBD-II Trouble Code: Intake Air Temperature Sensor 2 Circuit High
P0098 P0098 code definition Intake Air Temperature Sensor 2 Circuit High What the P0098 code means P0098 is the OBD-II generic code indicating the engine control module (ECM) has determined that the intake air temperature sensor 2 (IAT2) has an...