p0170 p0173 codes
 

I just bought a used clk 320 cabriolet and the dreaded check engine light came on, The only thing I have done to the car is change the oil, disconnected the battery to check to see if the radio code worked, and changed the air filter.
I read the codes with my scanner and got p0170 and p0173, tried cleaning the MAF with tuner bath and light still comes back. Although car seems to run fine, There is black soot in tailpipe though. I hear a lot of talk about adaptation values I don't see that On my OBD2 diagnostics software though. Here are some of the numbers in my freeze frame maybe this will help

Short term bank 1: -50
Short term bank 2: -50
intake manifold pressure 11.2 in hg 38kpaa
intake air temp 147 deg farenheit
MAF rate 0.6 lb/min 4.6 gm/s
ignition advance -16.5 deg
coolant temp 189 deg f
engine load value 21.2 %
throttle pos sensor 2.7%
RPM 693

these numbers mean nothing to me, the bottom line should I buy a new MAF or is this a waste of money, I just want the light off so my wife will shut up

Might be cheaper in the long run to find a competent MB tech and see what he thinks.

Throwing parts at it is a crap shoot.

If you don't know, you don't know. Find someone who does.

well, I bent over and went to the dealer, and guess what, it was the MAF, But once you have already payed for the labor for the diagnosis there is no turning back. besides at least I have a one year warranty, by the way are adaptation values some thing that is done automatically by the computer or does it have to be done by the dealer and also when you disconnect the battery does it mess up your adaptation values and other critical data??? seems like they would put a capacitor or something in the circuit to keep all the DATA long enough for the averqage battery changeout.