Mercedes SLK World banner

Not open for further replies.
1 - 6 of 6 Posts

Premium Member 2000 SLK230
2,624 Posts
Discussion Starter #1 (Edited)
OK, so for weeks... months...I've been dealing with resetting the CEL with this blasted P0410 error.

I've known it's the air valve, but it wasn't a huge issue since I was getting 33 mpg. But, when I wasn't carefully applying the accelerator at stop lights until the the engine warms up, the CEL light would pop on and I'd be blinded by it on my way home from work at 12 pm...FOR A 40 MINUTE DRIVE!!! Sorry...

Well, today I kicked it in the kahonas after finally replacing the air valve.

Here are some pics to illustrate:

Good vs Evel, had to destroy it to unscrew it.

good vs. evel.jpg

Interior view...YUCK!!!

Air Valve Interior view.jpg

It's best to have working room, so remove stuff!

The Colprate.jpg

Ahhhh, sweet relief killing the dreaded CEL. :tu:

Side note: If after removing stuff, then reinstalling stuff, and you end up with a P1236 error code, reattach the connector that engages the supercharger...silly me.

Premium Member 2002 SLK230K
17,144 Posts
I did mine last year, what a pain to remove. I also replaced the shut off valve which was just as bad. $66 at the dealer. The check valve cost me $40 for a four pack on ebay, got lucky with that.

2 Posts
For me the P0410 was caused by a corroded air pump check valve.
My original valve part # is 0021402860. That was replaced by a newer 0021406860.
I found an older check valve 0001407860 for $20. Tried it out for several weeks and the P0410 is gone for now. Let's see how it goes. If the older valve 0021406860 doesn't work, I will go for the newer 0021406860.
To remove the valve, you will need a 27mm or 1-1/16" low profile wrench.

Administrator 2009 SLK 55 AMG/Founding Member 2006
96,648 Posts

Welcome to The #1 Mercedes-Benz SLK Forum from Valrico, Florida!

Please update your location/vehicle (model and year) in your profile as it helps the members answer your questions which usually are based on that information.
‘Usercp’ at the top left of page, then ‘edit your details’ on the left side, ‘additional information’ near the bottom, edit your ‘location’ and ‘vehicle’. And it only takes about 30 seconds to do!

You might want to post an introduction in the ‘New members introduce yourself here’ section, if you haven’t already.

Some tips to make your visit here more enjoyable:

If you haven’t, please use the 'search' feature at the top right of the page for your questions as they have probably been asked before. Remember, ‘Search’ is your friend.
In addition, if you haven’t, please post your question in the appropriate discussion forum for a quicker response and only once. Be patient and a knowledgeable member will address your question.
If you wish to become PM (Private Message) - capable, you need 15 posts. To get those 15 posts quickly, just go to the ‘New members introduce yourself here’ section and welcome enough new members to obtain your needed posts to PM.
New members should be aware that the 'New Posts' link next to the 'Search' link top right of the info bar is a great way to see all of the posts you have missed since you were on the forum last. Remember to click 'mark forums read' under ‘quick links’ when you leave.
Also vote or enter our Ride of the Month competition:

Thank you
Moderator/Founding Member

5 Posts
CEL P0410 / Check Valve

Howdy all,

*CAN OBDII CEN-TECH ITEM 98568 $29. Works. Good value so far. Thanks to original posters for that suggestion. States 'KWP2000 Protocol' when 'linking to vehicle'. Port is just forward (bow) of the hood release.

precious is: 2001 SLK 230 R170

after arrival of cold weather, CEL came and stayed on. Loss of power (I'd say the supercharger is not adding to anything, so likely not engaged)
* I also suspect that I need a thermostat. (which seems could contribute to check valve failure if moisture is inherently involved).

-- CEL
-- P0410 [Secondary Air Injection System]
-- P0420 [Catalyst System Efficiency Below Threshold Bank 1]

Additional details from scanner section: 'Since DTCs Cleared'
(results existed before I did any clearing of codes myself)
-- Catalyst Mon [OK]
-- Htd Catalyst [N/A]
-- EVAP System Mon [OK]
-- Sec Air System [OK]
-- Oxygen Sens Mon [OK]
-- Oxygen Sens Htr [OK]


nk_400, are you still running well with the 0001407860? or does anyone think I'd need to hunt down the ~$85 USD OEM?
For $12 I'll gamble the purchase, just trying to avoid having it apart in the drive and having the wrong part.

cheers to all!
1 - 6 of 6 Posts
Not open for further replies.