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In the 2006 Lexus GS300, the O2 sensor, also known as bank 1 sensor 2, is positioned on the rear left side of the engine block, below the exhaust manifold. The front oxygen sensor is identified as bank 1 sensor 1, and the rear oxygen sensor is bank 1 sensor 2. Normally, bank 1 sensor 2 can be found on the exhaust pipe behind the catalytic converter. These sensors are about the size and shape of spark plugs and extend into the exhaust stream of the engine. Their role is to measure the oxygen levels in the exhaust and recommend any necessary engine adjustments to improve performance and prevent stalling.
The O2 sensor for bank 1 on a 2006 Lexus GS300 is situated on the back left side of the engine block beneath the exhaust manifold.