I'd go ahead and replace the O2 sensor. If you passed emissions, you're definitely safe as far as mixture goes. If your gas mileage starts to really suck, your exhaust smells like an Evinrude outboard motor, you can't get your car to operating temperature, you change your oil and it smells like gasoline, THEN you have a problem. Stop worrying, get your brakes done and enjoy the car.
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2022 BMW 530i
2021 MB GLA250
2020 BMW R1250GS
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