Question about 2002 Ford Ranger Regular Cab
A dirty Mass Air Flow Sensor (MAF) will cause and lean condition and also and dirty IAT will give you a lean condition. If you are using a oil charged air filter like K&N, droplet of oil will make there way to the MAF sensore and IAT causing them to give the wrong readings. You can buy a can of MAF sensor cleaner and clean both sensors. Make sure it's a MAF cleaner and follow the instructions. Good luck and hope this helps. Keep me posted, there are other reasons but this is the most common.
Posted on Jun 27, 2009
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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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