Thread: W124 DTC 4, Air Injection Inoperable
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Old 04-09-2008, 02:56 PM
Arthur Dalton Arthur Dalton is offline
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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.
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A Dalton
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