Date registered: Feb 2011
Vehicle: 2009 E350 4M Avant Garde, My Mistress 2002 S600, Wife 2014 C300 4M Avant Garde with AMG
Mentioned: 5 Post(s)
Quoted: 155 Post(s)
S600 secondary air injection
Here's another one!
The DAS still baffles me, but I'm getting better!
As I have reported before, my car has a (pre-existing) history of misfire of #12 cylinder, which has triggered the CEL on and off. But, as one can see from the DAS picture, it is currently only STORED, not active.
However, the secondary air injection faults shown are active, i.e. they currently trigger the CEL. There are also the associated cat faults, but they seem to be just a "chain" fault.
I have noticed, that when I start the car COLD, the air injection pump makes a lot of noise. After about 30 -40 seconds of warm-up, the pump goes quiet, and after about 80 seconds the engine is quiet in idle at about 500 RPM.
Even with all these fault, the engine runs smoothly, and without any apparent power loss.
Anybody have any suggestions on how to proceed from here?