In a previous post, i've write some problem with my car... the "check engine" light is on, and i've plug a code-reader on my car.

First, the guy tell me about i'm wrong to see 2 codes error, as right!

it's not 57, but 157 the code I get.

157 is "Mass Air Flow (MAF) sensor fault; low voltage.

But what is the mass air flow?