Question

I have a 2002 BMW 325i with a trouble code P0491. I need help

Answer 1

Hi there

This code is for an issue with the mass air flow sensor. The computer isn't happy with what it's seeing for a reading. This could be caused by vacuum leaks or a problem with the maf sensor itself. It's also possible there is an issue with the front O2 sensor providing the wrong info.

P0491 BMW - Mass Air Flow Sensor Low Flow Limit Detected Bank 1

Read more: https://www.autocodes.com/p0491_bmw.html