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If it could be caused by cap not tightened should the light go out as soon as cap is tightened or can it take time?

This happened 3 days ago and light is still on.

Vehicle: 2006 Toyota Camry 4 cyl

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P2195 A/F (airflow)sensor stuck lean

This A/F which is commonly refferred to as a 02 sensor (bank 1 ) sensor 1 is a engine management sensor,A  loose gas cap will not set p2195.Sensor do degrade this is a degraded sensor.

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