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When M320 cdi start the engine i can drive with no problem

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unlimited miles when i stop...
when M320 cdi start the engine i can drive with no problem unlimited miles when i stop and start again on hot engine the mersedez is going to limp mode. i have to wait the engine to cool down and start again so there is no problem
Submitted: 2 years ago.Category: Mercedes
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Answered in 5 minutes by:
11/13/2015
Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 2 years ago
Michael Warfield
Michael Warfield, Factory Mercedes-Benz Technician
Category: Mercedes
Satisfied Customers: 3,142
Experience: Mercedes-Benz Master Certified technician
Verified

Did you clean out the EGR pipe in front of the engine? It will set an EGR fault code because it clogs the flow. I'll try and find a picture.

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Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 2 years ago

So the pipe was clean? Did it have a lot of carbon?

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Customer reply replied 2 years ago
No, the EGR was clean too, but i decided to change it too.
Customer reply replied 2 years ago
Anything else???
Customer reply replied 2 years ago
I don't understand why paid 31 dollars???
Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 2 years ago

Is that the only fault code you have? Have you tried getting the engine scanned with a more advanced scanner? It should tell you a more specific fault code such as EGR positioned fault or poor flow.

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Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 2 years ago

Do you know if the EGR cooler below the intake manifolds is clear as well?

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Customer reply replied 2 years ago
No, I only have this code
Customer reply replied 2 years ago
everything is clean
Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 2 years ago

Ok, is your scanner capable of reading transmission fault codes or only OBD engine faults?

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Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 2 years ago

The 1402 fault code is a generic OBD fault. The actual engine and transmission computers will store specific manufacture fault codes that will be more specific to the problem. You could have a DPF/exhaust problem but it would be hard to tell with a generic fault code.

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Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 2 years ago

The mercedes specific code might be for the Diesel Particulate Filter pressure differential sensor. This is how the computer determines how much flow in the DPF sensor but I know it can trigger a generic P1402 EGR fault.

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Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 2 years ago

I would suggest replacing the DPF sensor if you a more comprehensive engine scan of the fault codes is not available.

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Customer reply replied 2 years ago
I will scan tomorrow with more advanced scanner but i agree with you and the change of the differential pressure sensor is my next move
Mercedes Mechanic: Michael Warfield, Factory Mercedes-Benz Technician replied 2 years ago

Ok, let me know what you find.

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