Question about GMC Sierra 1500
Tose are lean codes the 02 sensors are seeing a lean condition and likely its the mass air flow sensor or the intake hose to the engine is loose or cut.
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Posted on Aug 02, 2008
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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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