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Old 04-09-2008, 02:52 PM
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Join Date: May 2003
Location: Atlanta
Posts: 398
W124 DTC 4, Air Injection Inoperable

1995 E420 148k

I've got a trouble code 4 (among a couple others) and if I understand it right, that means the "air injection [is] inoperable."

my question is, what do i do with that? looking around fastlane they have a part called the air inject check valve. does my code mean that part has failed? if so, where exactly is that puppy?

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Old 04-09-2008, 02:56 PM
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Join Date: Aug 1999
Location: Florida / N.H.
Posts: 8,804
There is alot more to an AIR system than the check valve.
The first step is to see if the pump even comes on/runs..
Could be as simple as a fuse.

A Dalton
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