A4 Sedan V6-2.8L (AFC) (1996)
catalyst function.
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Depending upon the individual vehicle version, different connector plugs, colors or installation locations are employed to prevent the sensors from
being connected incorrectly.
REQUIREMENTS:
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If the oxygen sensor mounted upstream from the catalytic converter is malfunctioning or damaged due to aging, it will become impossible to adjust
the air/fuel mixture to its optimum ratio. The results are higher emissions and sacrifices in vehicle performance.
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It is thus essential that the engine-management system recognize these types of malfunctions when the DTC conditions are met, and that it reacts
by storing the DTC code and activating the MIL.
OXYGEN SENSOR CLOSED-LOOP CONTROL:
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OBD II monitors the following parameters for oxygen sensor closed- loop control:
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Response characteristics and reaction to aging process.
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Voltage.
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Oxygen sensor heater.
OXYGEN SENSOR AGING DIAGNOSIS: