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The O2 sensor on a MINI Cooper, specifically bank 1 sensor 2, is positioned at the primary cylinder head and following the catalytic converter. This sensor monitors the oxygen levels in the fuel mixture to alert the computer if it is too rich or too lean. This crucial information allows the engine to make adjustments to optimize performance. Driving with a defective O2 sensor disrupts the computer's ability to regulate the air-fuel ratio correctly, resulting in poor engine performance such as sluggishness, rough running, or stalling. However, if the engine can start and run continuously, it is still operational.
The sensor in charge of monitoring the air/fuel mixture in MINI Coopers can be found at the first cylinder head, following the catalytic converter.