Where is bank 1 sensor 1 located in the 2011 ford f150?

Bank 1 sensor 1 is the upstream oxygen sensor (before the cat) on the passenger side of a 2011 Ford F-150. Bank 1 is always the side with cylinder #1.f the oxygen sensor is going bad, the fuel-delivery and fuel-combustion systems will be thrown off. If a bad oxygen sensor disrupts the air to fuELRatio mixture, or too much fuel is injected into the engine, Your vehicle's gas mileage will be reduced.You can drive with a faulty O2 sensor. But You'll want to change it immediately because otherwise, You'll be spending more money on fuel and You risk having to spend more on a new catalytic converter as well.