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Means the PCM has detected a fault with the closed loop system, and is operating in open loop fault.
Open loop is a program that the PCM runs during start up, and continues to run until the PCM decides the o2 sensor is hot enough to be relied on for fuel control.
closed loop runs relies on the o2 sensor for fuel control.
open loop fault happens when an error is reported.
look for O2 sensor DTCs.
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