Thread: W140 Air Injection Pump Replace / Check Engine Light
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  #10  
Old 01-28-2005, 04:23 PM
oestek oestek is offline
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Join Date: Jul 2003
Posts: 61
My AIR pump seems to only engage on start-up, but I'll double check that today. Sounds like I may have an aging 02 sensor or 2. Is there a bench test for the 02?
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