Engine system failure

  • 1 POST
  • 2007 FORD FOCUS
  • 4 CYL
  • 4WD
  • 65,000 MILES

I just got my Ford Focus style diagnosed by a mechanic who said the following problems are;

Code Make Description P0299 Generic Turbo / Super Charger Underboost

Code Make Description P010F Generic Mass or Volume Air Flow "B" Circuit High

what are these and what do I need to fix?

the mechanics did not seem assured what that meant so I am hesitant to take it back to them as they cannot give me a price quote, because they claim they need to take engine apart to see the exact problem.

can any one help me please?

Do you
have the same problem?
Wednesday, May 4th, 2011 AT 8:35 PM

1 Reply

  • 8,692 POSTS

The turbo/supercharger under-boost simply means the turbo/super cannot reach maximum boost.

While this could be a turbo/supercharger mechanical problem, it is most likely the MAF sensor.

They should start by cleaning the MAF with a MAF cleaner, if that does not help then the MAF may be needed to be changed.

By taking the "engine apart" they are talking about the turbo/supercharger. That should be LAST on the list.

Cleaning the MAF would be a good place to start.

MAF calculates volume of incoming air, so if malfunctioning, it will tell PCM that not enough air is getting into engine, which would cause the boost code.

Was this
Thursday, May 5th, 2011 AT 12:35 PM

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