My 97 E350/460ci occasionally sets trouble code 4011. It clears every time I check it with my code reader. Something about insufficient secondary air injection. The dealer ship couldn't duplicate/diagnose the problem. Maybe something with the air injection solenoids.
Otherwise, it runs fine. I did notice on the passenger side of the engine compartment a large black metal filter looking thingie with about a 3/4" outlet that doesn't have any hose on it or seem to go anywhere else. Once in a while when you start it i hear a sort of soft popping noise for a few seconds that I would associate with the air pump.

Also can't get the ABS light to go away. It's out when you start it but as soon as you get going it comes on. I flushed the fluid and replaced the rear sensor to no avail. Also tried to flush out the front tone wheels and sensors.

Any thoughts would be appreciated.

Thanx,
Beartracks

 

Isn't it P0411? That's a problem with the air pump system as you already guessed. I did a google search and found lots of hits to read about p0411.

Your ABS problem sounds like a wheel sensor, since it doesn't fault out until you start moving. See if the local parts store can read the abs codes.

 

I think it's 4011 but I'll look at my records. I'll try the parts store but the local brake/suspension place (commercial) I use could'nt find a place to plug in a reader. It's apparently different than the engine computer readout.

 

No such thing as a DTC "4011".