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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? |
#2
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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.
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A Dalton |
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