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P0135 BMW - is the bank1 o2 sensor the one on the top lefts side of the engine on a 2003 325i?

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P0135 o2 heater circuit ( bank 1, sensor )
BMW 325i 2003 v6 2.5 L
Where is bank one located ?

Vehicle: 2003 BMW 325i

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P0135 02 heater circuit malfunction (Bank 1 Sensor 1)

The location is the front of the engine

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