The oxygen sensor sends important fuel mixture data back to the fuel injection control unit on your Mini Cooper. This information is then used to make any mixture adjustments required. A clogged or faulty oxygen sensor can increase fuel consumption dramatically. Other symptoms are poor starting, hesitations, and rough idle. To perform a proper tune-up, BMP recommends replacing the single wire sensors at 20,000 miles and the 3 wire units at 50,000 miles. 2 required per vehicle.

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