Re: Check Engine Light with code PO173
According to the Mercedes forum, the most common issue for the P0173 is a failing mass flow air sensor. I believe the OEM Bosch part is $145 from Autohaus or $100 on Amazon:
https://www.amazon.com/Bosch-0280217...sch+0280217515
Last edited by Rpaczan; Aug 10, 2016 at 09:59 PM.