![]() ![]() Consult your service manual for it's location if you need help. In the vast majority of cases, simply cleaning the MAF sensor does the trick.There could be a vacuum leak downstream of the MAF sensor. There is also an issue with some vehicles where the MAF sensors leak the silicone potting material used to protect the circuitry. Note: The use of "oiled" air filters may cause the MAF to become dirty if the filter is over-oiled. The MAF (Mass Air Flow) Sensor is dirty or faulty. You will more than likely not notice any drivability problems, although there may be symptoms such as a lack of power, detonation (spark knock), and/or a hesitation/surge on acceleration.Ī code P0171 may mean that one or more of the following has happened: Over time this makes a hole in the tube causing a large vacuum leak. ![]() The focus had a problem with the PCV Tube collapsing.
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