Originally Posted by dlssmith

Just to jump in here: About six months ago I replaced the MAF sensor with one from a local auto parts store - I assume it to be reman, though it does say Bosch on the side. I wouldn't know what it came out of originally.

Now Christy is pulling P0170 and P0173 again.

Could it really be the MAF sensor, again?

This, on my 99 W210.