Question about 2010 Ford Fusion 2.5
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Mar 20, 2017 | 2001 GMC Sonoma Extended Cab
DTC P0171 is a lean code that can be caused by your EGR system, more likely than your O2 sensor.
DTC P2196 - Lack of HO2S-11 Switch, Sensor Indicates Rich
A HEGO sensor indicating rich at the end of a test is trying to correct for an over-lean condition. The test fails when the fuel control system no longer detects switching for a calibrated amount of time.
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