Secondary Air Pump and Air Injection Pump Check Valve
Thread Starter
Newbie
Joined: Jun 2018
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C300
Secondary Air Pump and Air Injection Pump Check Valve
0021408460 Secondary Air Pump Check Valve
Hi guys, I have a quick question about replacing my secondary air pump and a part I bought from Fcp euro called a secondary air injection pump check valve.
I know the air pump is a beaten to death horse on the threads from the searching I’ve done but I can’t find anything about replacing the check valve I bought. In most of the videos I’ve watched where they replace a check valve, it looks different (two silver cannister looking parts). On Fcp Euro, when I went to buy the air pump it also recommended changing this part 0021408460 as well as the relay. I’ve included a picture of it in the attachment. I’ve also seen it referred to on Amazon as a vacuum check valve. I haven’t started the repair yet so maybe it’ll be a glaringly obvious part connecting a valve somewhere but I was hoping someone might know what this part is exactly and where it goes.
Thanks a lot for any feedback.
Former Vendor of MBWorld
Joined: Dec 2014
Posts: 1,142
Likes: 154
Mercedes
0021408460 Secondary Air Pump Check Valve
Hi guys, I have a quick question about replacing my secondary air pump and a part I bought from Fcp euro called a secondary air injection pump check valve.
I know the air pump is a beaten to death horse on the threads from the searching I’ve done but I can’t find anything about replacing the check valve I bought. In most of the videos I’ve watched where they replace a check valve, it looks different (two silver cannister looking parts). On Fcp Euro, when I went to buy the air pump it also recommended changing this part 0021408460 as well as the relay. I’ve included a picture of it in the attachment. I’ve also seen it referred to on Amazon as a vacuum check valve. I haven’t started the repair yet so maybe it’ll be a glaringly obvious part connecting a valve somewhere but I was hoping someone might know what this part is exactly and where it goes.
Thanks a lot for any feedback.
--Kyle
Super Member
Joined: May 2018
Posts: 505
Likes: 288
From: Sammamish, WA
2011 E350 Wagon, 2010 GL450
Why does FCP recommend replacing it with the vacuum pump? Is it known to go bad?
I looked for it under the hood but couldn't find where to swap the new one in. Does anyone have a picture of where to find it? I'm sure it'll be a facepalm when I see it.
I looked for it under the hood but couldn't find where to swap the new one in. Does anyone have a picture of where to find it? I'm sure it'll be a facepalm when I see it.
Thread Starter
Newbie
Joined: Jun 2018
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C300
Here’s what it showed on their website though 🤷*♂️
Super Member
Joined: Apr 2010
Posts: 705
Likes: 55
From: LA LA Land
'08 C300 MM Pano
Something like this can only happen at FCP Euro... 
A certain recommendation for a needed part is made on their website only to then end up having their sales department say it isn't needed. 
.
.
<---- Oh, look at that... How devilish of me... Satan made me do it!
A certain recommendation for a needed part is made on their website only to then end up having their sales department say it isn't needed. .
.
<---- Oh, look at that... How devilish of me... Satan made me do it!
Last edited by IGB; Jun 27, 2018 at 01:25 AM.
Former Vendor of MBWorld
Joined: Dec 2014
Posts: 1,142
Likes: 154
Mercedes
--Kyle
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