1999 ML error codes po170 po173
 

Hi all,

I have an check engine light on, which when pulling the codes reads po 170 and po 173. I took it to a local shop, they said air intake problem or mass air flow meter. The said they fixed the air intake. I have replaced the mass air flow meter. Light still on after 10 restarts. Do I actually have to have the codes cleared or...? Any thoughts would be appreciated.

thanks, jeff