Question about Ford F-150
P0174 is a dirty air-flow (MAR) sensor. It is located in the inlet air tube near the throttle body. Just clean or replace the sensor. If you want to clean it first, use only electronic cleaner as any other cleaner may damage the sensor. Disconnect the air inlet tube in front of sensor and spray the sensor with electronic cleaner through the screen at the wire element in the center of the sensor. Let it sit a while and spray again. Re-connect the air inlet tube and start engine. If P0174 appears again, you need to replace the sensor.
Posted on Oct 07, 2010
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Posted on Jan 02, 2017
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