2012 Subaru Outback - CEL, Anti-Skid, Brake Lights on

We have a 2012 Subaru Outback and the check engine light is on, anti skid light flashes, and the brake light is flashing?? Took it to a mechanic and they think it maybe a oxygen sensor $450.00 approx. The code read Bank 1 is running lean? They reset it a week ago and now the lights are doing the same thing? Any thoughts on what it could be?

That proves that there is a problem, Erasing the fault code does not qualify as a repair.

Checking the fuel trim values might indicate that the Mass Air Flow sensor is dirty or failing.

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