Question about 2003 Chevrolet Impala
P0171 is not a defective sensor, it is the bank 1 (irrelivant) senor that has sensed a lean mixture... in other words too much oxygen in the exhaust.
This is usually a MAFS or MAP fault but it can be a leaking inlet gasket or simply a vac pipe disconnected.
Dony change an o2 sensor, they are working fine
Posted on Sep 11, 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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