Question about 2005 Ford Focus
ODB code P0171 system to lean on bank 1 was told to change the O2 sensor. Will that take care of the problem?
Mine did the same thing, it turned out to be a vaccuum leak. $170 fixed it. I may have caused it by trying to use my car as a hovercraft to get out of a trapped position. Stomping it too hard in an emergency.
Posted on Dec 31, 2012
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Posted on Jan 02, 2017
SOURCE: Code #P0171 & code #P0174
The most common problem on a Ford with these codes is deteriorated PCV hoses. Check the hoses from the PCV valve to the intake manifold. Pay special attention to the rubber elbows. They often crack on the inside curve and the crack is hard to see.
Posted on May 22, 2008
SOURCE: check engine light on
Generally when these codes appear it is due to insufficient fuel pressure. Test your fuel pump to ensure it is within specs. Have you changed your fuel filter?
Posted on Jan 15, 2009
Bank one is toward the front of the vehicle. Sounds like the heated oxygen sensors have gone bad. The Oxygen Sensors are located in the exhaust pipe and require a special socket to remove and replace.
Posted on Jan 16, 2009
Those codes are for the oxygen sensors, lean fuel mixture on both banks. Change them, problem with stalling and rough idle should go away.
Posted on Apr 23, 2009
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P0171....System too Lean (Bank 1)
P0116....Engine Coolant Temperature Circuit Range/Performance Problem
right it means you have a faulty O2 sensor and i would imagine the one after the cat ,and the engine is running cold so its either a problem with no thermostat fitted or outside ambient temperature too cold and you will need to put a piece of cardboard in front of radiator to stop the air flow and the wind chill factor
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