Question about 2003 Ford Explorer Sport
This fords have very comun problems with maf sensors geting contaminated, if you have not or can hear any vacium leaks, the problem is goin to be a conataminated mas air flow snsor (maf)
allow the engine to cold down for at least 15minutes and the remove the air filter hosing and inside has to have a sensor, clean the two liitle resistors inside with brake or carburetor cleaner, allow it to dry and reinstall it.
if this inf help please mark it as fixya ranking after you try what i said
Posted on Jun 30, 2008
The po171 code is more than likely a lazy oxygen sensor on the drivers side of veh it will be the upstream sensor as there are 2 sensors on each side of the engines exaust upstream being the first one inline eg farthest from muffler as fpr the po174 its the other side oxygen sensor eg passenger side upstream as well these sensors become slow in response time causing intermitent codes before changing these sensors try using highest octane fuel for the next 3 fill ups and change oil if u see no change in intermitent codes then go to local parts store and purchase 2 oxygen sensors both upstream and replace both
Posted on Jun 30, 2008
SOURCE: my check engine light came
This means both banks have a lean condition. Most likely if you have a 4.0 SOHC motor your upper intake is sucking in air at the orings at the bottom of the intake. These are really bad about when they are cold in the morning the shrink and let air get by and after the engine warms up the orings soften and seal off.
Posted on Apr 29, 2011
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Posted on Jan 02, 2017
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System Too Lean (Bank 2)
Basically this means that an oxygen sensor in bank 2 detected a lean condition (too much oxygen in the exhaust.
Note: This DTC is very similar to P0171, and in fact your vehicle may show both codes at the same time.
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