I have a MB 2009 E320. It went in to limp mode with codes P 0299.

Asked by Jan Jan 16, 2022 at 09:04 PM about the 2009 Mercedes-Benz E-Class E 320 BlueTEC

Question type: Maintenance & Repair

After 3 trips to repair shop, and $5000…my car is still going into limp mode.  
I’ve had the following done:  smoke test, new fuel filter, fuel line manually
cleaned, EGR cooler kit w/seals and gaskets, and last a turbo actuator.  The
last receipt remarks state their is oil within the charge pipes.  However the
manager told me that all the upper end carbon has been cleaned
The Turbo actuator was replaced which control the vane control.  The
converters were not cleaned or dpf which cleaning would most likely help the
situation.  They don’t offer that service.  Then I had fault code 2359, and took
locally to have it read and turned off. I then ordered a MB code reader.  Will
attach photos.  Now fault code P0299.   Any  suggestions would be greatly
appreciated.  

2 Answers
2,920

VRoom12345 answered 2 years ago

You really should take the vehicle to a reputable MB independent garage. aP0299 is a general turbo underboost code. So it could be a few things a fault with the turbo or supercharger, engine has low oil pressure, EGR system is faulty, air intake blockage or leak, or the boost pressure sensor is faulty. Good Luck finding the problem.

Mark helpful

Jan answered 2 years ago

Thank you for reply. I’m currently getting fault code P2A00, and have ordered an 02 air fuel circuit, #1 upstream sensor to have my husband install. Trying to figure out where that sensor goes? I know it’s passenger side, I believe it’s before the cat converter, wherever that is. ‍♀️ I’ve been told it’s behind engine near firewall, and a diagram I found shows it to be underneath rear, exhaust area. Any help would be greatly appreciated.

Mark helpful

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