The O2 sensor bank 2 sensor 1 on a 2009 Ford F-150 with a 4.6L engine is located on the passenger side of the engine, before the catalytic converter. It is positioned in the exhaust manifold or just downstream of it. This sensor monitors the oxygen levels in the exhaust gases to help optimize fuel efficiency and emissions. Accessing it may require lifting the vehicle or removing some components for better visibility.
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