Question about 2000 Ford Windstar
Codes P0171system too lean (bank 1) and P0174 system too lean (bank 2) keep coming up. I have checked for vacuum leaks and I have taken out the M.A.F. sensor and cleaned it with electronics cleaner (it didn't look dirty any way).I hate to start changing O2 sensors just to see if they're bad t, that would be expensive. Any ideas?
This is very common on these. the upper intake seals leak and should be replaced. It is not a noticable vacuum leak and is usually worse when the engine is cold. It is not a very difficult job to do
Posted on Mar 01, 2009
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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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