Check engine light stays on after Secondary air pump was changed
Thread Starter
Newbie
Joined: Apr 2020
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Mercedes GL 450
Check engine light stays on after Secondary air pump was changed
My mechanic replaced my secondary air pump and switch in my 2012 Mercedes GL 450. He reset my check engine light and it goes back on after a couple of days any suggestions would be greatly appreciated.
Senior Member
Joined: Jan 2017
Posts: 254
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From: Houston, TX
Mercedes Benz 2007 GL450 , 2012 BMW 528i
Did you try to search the code online? what is the result of code search?
Obviously, car doesn't think that the problem is fixed. either diagnosis was wrong or your new part is defective.
If changing a component doesn't fix the code, usually it is wiring related to that component.
Obviously, car doesn't think that the problem is fixed. either diagnosis was wrong or your new part is defective.
If changing a component doesn't fix the code, usually it is wiring related to that component.
Thread Starter
Newbie
Joined: Apr 2020
Posts: 3
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Mercedes GL 450
Yes the code was 0810 and 0814 which is the problem I talked about. He thought the same thing on the defective part and replaced it and it came back again. I will tell him to check the wiring. Thank you for your quick response
Member
Joined: Apr 2017
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1999 E240, 2007 GL500, 2004 Suburban Z71, 1997 Ford Escort MK7, 1979 VW Beetle
Verify the air pump check valves for obstructions, sometimes they have a lot of dirty from the exhaust system inside and can't let the air flow correctly;
if this not the case, check the oxygen sensors signal with a oscilloscope or Star Diagnosis tools, sometimes they are going bad.
if this not the case, check the oxygen sensors signal with a oscilloscope or Star Diagnosis tools, sometimes they are going bad.
Super Member
Joined: Feb 2007
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From: Republic of Texas
W203 W212 W211 R53MCS
Or you can tell him to get the proper equipment and do correct diagnostic. For example, using Xentry software you can actually do a function test of the air injection system. Once you see the failure you can proceed to inspect several items. I don't know if any other aftermarket scanner will do this test.
