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Q:

Check engine lights on and diagnostic code is P0104 and P0109.
What is to check? on 2005 Ford Escape

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The light comes frequently again shortly after clearing.
Is there a known common problem giving that OBD code?
(1) Answer
mass airflow sensor circuit intermittent.Had the same issue on an escape I repaired.Check the wiring at the mass air flow sensor connector. Pull on the wires,more than likely one of them will pull like stretch armstrong,indicating broken wiring.Good luck and let us know what you find!