Ford Repair Questions? Ask a Mechanic for Answers ASAP
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Bank one is the exhaust bank nearest number 1 cylinder, as your C-Max only has one exhaust manifold this is not relevant. Sensor 2 is the down stream sensor, that is the sensor after the catalytic convertor.
The mechanic should really know this.
Depending on what the code is, it may not necessarily be the sensor at fault, codes can be triggered up due to wiring problems or air leaks in the exhaust.
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