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Matt, Engineer
Category: Mercedes
Satisfied Customers: 21870
Experience:  Mechanical Engineer with 23 years experience in the auto industry, 8 yrs in formula 1 engine testing
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I have a 2009 ML63 with 106,000 miles. The Check Engine

Customer Question

I have a 2009 ML63 with 106,000 miles. The Check Engine Light is on with a code of PF208. Dealer is telling me I have to replace Intake Manifold at the tune of 7K. Is it worth it to get it fixed? Hard to believe Intake is the problem. Car runs fine.
Submitted: 1 year ago.
Category: Mercedes
Expert:  eautosales replied 1 year ago.

whats the trouble codes?

Customer: replied 1 year ago.
Expert:  eautosales replied 1 year ago.

I do not see that as a valid code are you sure?

Customer: replied 1 year ago.
Let me double check. Hang on.
Expert:  eautosales replied 1 year ago.


Customer: replied 1 year ago.
The error code is P228F.
Expert:  eautosales replied 1 year ago.

I don't see that either ill opt out maybe another expert can jump in

Expert:  Chad Farhat replied 1 year ago.


Expert:  Matt replied 1 year ago.


another expert here

the closest fault code that matches is P0228 which is a faulty throttle pedal position sensor

if you have this issue I'd expect to have issues with driveabilty and hesitation from the engine

now if the fault is with the inlet manifold a common fault is with the variable inlet mechanism and there's a repair kit to tackle this without having to repalce the manifold

see here

Customer: replied 1 year ago.
The p228f from all my research is the following error. FUEL RAIL PRESSURE (FRP) REGULATOR INCORRECT LEARNED VALUE
Your reference to the intake manifold repair kit unfortunately doesn't apply to mine. I have the 6.3 v8. I am regretting giving over my credit card to you guys.
Expert:  Matt replied 1 year ago.


Ok if you suspect the fuel pressure then I'd suggest the next step is to get a pressure gauge onto the fuel injector rail and measure the pressure with a running engine

if its below specification then you would have a lack of power ?

if its a over pressurizing then you would be running rich and using too much fuel

Expert:  Matt replied 1 year ago.


do you still need help?

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