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2012 Chevy Cruze LT
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1. Code PO 171(System too Lean (Bank 1) what typically causes this issue.
2. Code PO 106(Manifold Absolute Pressure/BARO Sensor Range Performance
3. Intake Air Flow System Performance
4. Code PO507 (Idle Air Control System RPM Higher than expected
5. Code PO15B (O2 Sensor Delayed Response - Lean Too Rich Bank 1 Sensor 1

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A vacuum leak. Probably from your camshaft cover. Read the 1st thread and then inspect your cruze


 
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