P0155 BMW - How much do it cost to get this fixed

Question

P0155 Code and Check Engine Light on 2009 BMW X5

Oxygen Sensors (O2S) or Heated Oxygen Sensors (HO2S) need to reach a minimum operating temperature of 750 degrees F to produce an accurate voltage signal. The faster the heated oxygen sensor reaches that temperature the faster the sensor will start sending an accurate signal to the Engine Control Module (ECM). In order to achieve the require temperature, a heater element is included inside the heated oxygen sensor. The ECM controls the heated oxygen sensor heater element based on signals from the engine coolant temperature and engine load. The ECM controls the heater element circuit by allowing current flow to ground. The ECM monitors the voltage signal received through the heater element circuit and determines the state of the circuit by comparing the voltage detected with the factory specifications.

Answer 1

P0155 is for bank 2 sensor 1 (air to fuel ratio sensor)

if the sensor is bad, a new dealer sensor is about $270 and labor is anywere from 0.5 hour to an hour.