my car shoew code for oxygen sensor pre and post cat on bank 2 but the car does not have bank 2.

Question

I swapped the ecu and after that the code came up. How do i code the ecu to stop reporting the error?

Answer 1

Hi there

Cylinders 4-6 are considered bank 2 on this engine. This is the sensor with the grey wiring harness protector on it.

The code is for the sensors heater and in most cases the sensor itself is the cause of the problem.

P0155 BMW - O2 Sensor Heater Circuit Bank 2 Sensor 1

Read more: https://www.autocodes.com/p0155_bmw.html