I just discovered ....
P2016 & P2085 are corrensponding codes for po170 & po173.

With that said, it could be anything from fuel pressure regulator, fuel pump, Air Mass Sensor, etc.

But since I changed the Air Filter the day the problem started and and since CLK's 2001 m112, from what I've read on the forums, are hard on Air Mass Sensors, I'm betting Air Mass Meter/Sensor.

I did check to verify that tubing and air filter housing are fastened corretly.

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Russell McMahon
Tulsa, OK
2001 CLK 320
1992 400se
1993 400e
2000 320ML