Code P0410
Thread Starter
Newbie
Joined: Jun 2015
Posts: 5
Likes: 0
E320
Code P0410
Okay... so I know there has been many posts on this particular code and I've read so many of them that my eyes are about to bleed and still have not been able to find the fix. Here's my story.
I own a 2003 E320 sedan. Recently I have replaced all 4 O2 sensors and along with it had a P0410 code. I replaced the Secondary air pump and it runs normal on a cold start. The code was cleared and about 200 miles in, my check engine light came back on. I took it to the local auto parts store to get a code reading. The suggestion was to replace the relay. My initial thought was, if the relay was bad, wouldn't that cause the air pump to not function? At any rate, for such an inexpensive part, I bought a new one and replaced it. Just a side note, all the parts that I replaced are genuine Mercedes OEM pieces. I also checked the tubing and replaced those just for good measure.
Cleared the code and drove the car for about 3 days and the CEL came back on to my dismay. Had it tested again and it same code came up saying I need a new relay. My car is about to get a SMOG check and I am afraid it won't pass. Any ideas of what else I can do to fix this issue? Thanks!
I own a 2003 E320 sedan. Recently I have replaced all 4 O2 sensors and along with it had a P0410 code. I replaced the Secondary air pump and it runs normal on a cold start. The code was cleared and about 200 miles in, my check engine light came back on. I took it to the local auto parts store to get a code reading. The suggestion was to replace the relay. My initial thought was, if the relay was bad, wouldn't that cause the air pump to not function? At any rate, for such an inexpensive part, I bought a new one and replaced it. Just a side note, all the parts that I replaced are genuine Mercedes OEM pieces. I also checked the tubing and replaced those just for good measure.
Cleared the code and drove the car for about 3 days and the CEL came back on to my dismay. Had it tested again and it same code came up saying I need a new relay. My car is about to get a SMOG check and I am afraid it won't pass. Any ideas of what else I can do to fix this issue? Thanks!
Thread Starter
Newbie
Joined: Jun 2015
Posts: 5
Likes: 0
E320
It's a brand new pump and I do hear it running on a cold start and stops as soon as rpm decreases so about 20 seconds or so. But just for good measure, I tested all 3 relays and they were all good. Could a bad fuse possibly throw this code?
Thread Starter
Newbie
Joined: Jun 2015
Posts: 5
Likes: 0
E320
Wouldn't a bad EGR valve throw it's own code? I might have to take it apart and clean it to see. At this point it's either that or throw in the towel and just get an new car lol. It's hard to let go since I got her brand new and she was my first car. Served me well through the years but the ole girl is finally starting to break down.
MBWorld Fanatic!
Joined: Apr 2015
Posts: 1,486
Likes: 46
From: dmv
2009 E550 2000 Honda civic mash n' go
Not exactly that specific. It could be a generic code like secondary chain malfunction. I understand that you do not have that code however it wouldn't be a bad idea to check anyways.
Newbie
Joined: Jan 2016
Posts: 7
Likes: 0
2005 CL65 AMG
Mind you, I have the V12TT engine so my configuration will differ slightly, but the theory of operation is the same. Aside from the pump and relay, there is also a 3-way vacuum changeover valve and two vacuum actuated check valves. When I had the P0410 code, I initially replaced only the pump, which I found to be very corroded. The code came back after a few days. Relay tested good. I removed the engine cover and passenger side intercooler and inspected the vacuum lines and valves. I found that one of the vacuum hoses going to the changeover valve was cracked and torn, and the others were loose. I replaced the vacuum hoses and cleaned the large check valves with carb cleaner. These other issues are what allowed moisture to reach the pump to begin with, and cause the corrosion. I have driven the car over 1000 miles since, and have not had any codes pop up.
Thread Starter
Newbie
Joined: Jun 2015
Posts: 5
Likes: 0
E320
Mind you, I have the V12TT engine so my configuration will differ slightly, but the theory of operation is the same. Aside from the pump and relay, there is also a 3-way vacuum changeover valve and two vacuum actuated check valves. When I had the P0410 code, I initially replaced only the pump, which I found to be very corroded. The code came back after a few days. Relay tested good. I removed the engine cover and passenger side intercooler and inspected the vacuum lines and valves. I found that one of the vacuum hoses going to the changeover valve was cracked and torn, and the others were loose. I replaced the vacuum hoses and cleaned the large check valves with carb cleaner. These other issues are what allowed moisture to reach the pump to begin with, and cause the corrosion. I have driven the car over 1000 miles since, and have not had any codes pop up.
Trending Topics
Newbie
Joined: Aug 2019
Posts: 1
Likes: 1
MErcedes E320 1999
1999 E320 w210 secondary air pump relay
How can I check if the relay for 1999 E320 is functionning properly or defective . I got the P0410 code and would like to make sure if the relay is defective or ok before replacing the secondary air pump. Thank you
MB World Stories
The Best of Mercedes & AMG
8 Oddball Mercedes Ideas That Actually Made it to Production
Verdad Gallardo
Dubai Tuner Gives the Mercedes G-Class An Entirely New Look
Verdad Gallardo
Six Gift Ideas Your AMG Loving Dad or Grad Will Cherish
7 Craziest Things AMG Gas Ever Built
Verdad Gallardo
New Electric Mercedes-AMG GT 4-Door Coupe Unveiled: 10 Things You Need to Know
Verdad Gallardo
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
