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Ron
Ron, ASE Certified Technician
Category: Mercedes
Satisfied Customers: 33469
Experience:  ASE Certs.
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, I replaced the engine in my 1999c280. Everything

Customer Question

Customer: ***** *****
JA: Thanks. Can you give me any more details about your issue?
Customer: I replaced the engine in my 1999c280. Everything seems fine except it is throwing a o400 code. looking for the answer or how to fix the problem.
JA: OK got it. Last thing — Mercedes Mechanics generally expect a deposit of about $18 to help with your type of question (you only pay if satisfied). Now I'm going to take you to a page to place a secure deposit with JustAnswer. Don't worry, this chat is saved. After that, we will finish helping you.
Submitted: 10 months ago.
Category: Mercedes
Expert:  Ron replied 10 months ago.

Hello, my name is ***** ***** I am a professional here at Just Answer. I have noticed that your question was not getting a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.

The code P0400 can be set by any of the following,

  • EGR Transducer Y31/1
  • Defective Exhaust Gas Recirculation (EGR) Valve
  • Restricted Intake Manifold Exhaust Gas Recirculation (EGR) Passages
  • Manifold Absolute Pressure (MAP) Sensor

    In order to determine the cause you are going to need to do some testing. I have enclosed the steps in the link below. Copy and paste the link to your browser to open and view them.

    https://dl.dropboxusercontent.com/u/104923897/P0400%20Jan%2017.pdf