Question about 1998 Ford Windstar
Check for a small hole in the right angle rubber hoses between the PCV valve and the motor. A hold in the hoses will give a false alarm indicating "lean bank1" and "lean bank2" on Fords and Lincolns and once you replace those faulty hoses or at least tape them up you can reset the codes at the parts store and it should not come back until you have holes in the hoses again. you can also keep driving the car and after numerous "successful trips" with no more codes, the engine light will eventually go off if you have corrected the problem.
Posted on Aug 03, 2010
This problem is caused by defective O2 sensors in both bank one and bank two of the engine, these are the sensors before the catalytic converter, you must replace them from under the van, be very careful to route the wiring to them just as it was or you will end up with burnt wiring and another fault code
Posted on Aug 02, 2010
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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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