the p0170 code can be of 3 things, MAS (99%) of the time, vacuum leak or fuel pressure regulator i think.
I change my MAS recently and took 3 days for the CE light to go out.
Everything is fine cept the engine still hunts around.
1997 Silver AMG C36
OEM Advantegarde Grille
OEM Clear Corners
W210 Blinking mirrors
Zender Rear Lip Spoiler