P2A00 - A/F Sensor Circuit Range/Performance (bank 1 sensor 1)

ANMVQ

Well the first thing I thought was a pre sensor air leak? You looked at that gasket already but can see the whole thing ? Can you get your hands on a mirror stick and look up there? you can also try sticking a piece gasket down there and rev the car and see if there is any exhaust coloring on it? Paper might work too but not sure if it catch fire with the exhaust temps( Piping)

you can also use the soap water test on the intake pipes , Spray the connecters down ?

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14 Q50 AWD, ARK, ECUTEK (SEB), Takda,