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hi which sensor is this? pre-cat or post-cat

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HI there

This code is for bank 2 sensor 2. So this is the rear O2 sensor on bank 2. Post converter.

P0161 BMW - O2 Sensor Heater Circuit Malfunction Bank 2 Sensor 2

Read more: https://www.autocodes.com/p0161_bmw.html

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