Check engine light came on today on first start up.
Got the code read:

P0172 System too rich bank 1


They reset the check engine signal and it did not come back on.



Did a dirty/ failing sensor trigger this? Possibly MAF from posts I searched. Is cleaning a MAF recommended or is replacement a must?

What you do you guys think?

Thanks,

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'09 - Black - BMW X5 4.8i
'08 - Black - BMW X5 3.0si
'04 - Black - BMW X5 3.0i - SOLD