Question about Ford Escort
P0171 is system to lean ( bank 1 ). one of the most common causes for a p0171 is a dirty mass air flow sensor ( MAF ). just clean or replace maf sensor. use maf sensor cleaner found at most auto parts stores. do not use any other cleaner. disconnect air tube just ahead of sensor, and then spray the cleaner through the screen at the wire element on the maf sensor,let cleaner soak in for several minutes. then give it another shot of cleaner. let it set another 5 minutes. then reconnect air tube and start engine. or you can follow directions on back of maf spray can. if the lean code comes back, you may have to replace maf sensor. unless you have a vacuum leak.
Ford p0171 AND p0174 lean codes can also be set by a bad EGR differential pressure sensor. These sensors have a very high failure rate once a vehicle has more than about 60,000 miles on the odometer or is more than five or six years old. hope this helps !
Posted on May 28, 2011
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Posted on Jan 02, 2017
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