hotgreek

I'm getting ''check engine'' on my car with code P0410 .After I search around I find out that my auxiliary air pump or secondary air pump went out..Some guys said that it might be the relay cost $45 or the pump $ 500. Is any way to find out witch one is it ? can I test the pump to see if it works ? And if it doesn't work ,any one knows where to buy cheap or rebuild them ? Where is the location of the relay ? Any info will help
thank you

MB-Dude

In my case (which is still ongoing), the relay contacts were very corroded. Thus, the relay needed to be replaced. This alone had solved P0410 errors for others and you can do a search for P0410 errors and read more. For me (and I suspect others), the pump is also going bad and will have to be replaced. After replacing my relay, I get a P0410 error about once a week; before, it was daily. I clear the error and drive on until I can get the pump replaced.

Location of the relay is in the passenger-side electrical box, in the engine compartment. It's the electrical box next to the cabin air intake. Look for a tan/brown relay. Once removed (just pull it out), you can easily test the relay with a multimeter, 12v battery, and 4 clip leads. The important contact to test is the NO (normally open) set.

Even if the relay checks out OK, I'd suggest replacing the relay unless your car has less than 40,000 miles. IMHO as an electrical engineer, the relay is sufficient for the task but not robust enough for long-term use in this application. Again, IMHO, this circuit seems to have some residual 'Chrysler' in it relative to the robustness of parts application.

The relay is not special and can be found just about anywhere. The pump is what the pump is, and a special application. I haven't checked yet, but there are probably aftermarket possibilities out there.

Cheers,
Jeff

hotgreek

ok thank you very much.My car has 80k .I will try to replace the relay first and see what happened ... if you find any info about pump price let me know please... hotgreek68@hotmail.com
THANK YOU

marktan

That is a pita code to diagnose! I spent several months off and on chasing down that code on my S600.
Can you hear the pump running? If you have access to a Star DAS unit, you can acutate the pump on/off. That can determine if it is a pump or relay issue, but there are several things that interact to keep that code clear. Mine turned out to be a vacuum line (figured out after replacing everything under the sun).

Here is the link to my saga and its resolution:
https://mbworld.org/forums/5497795-post7.html
Hope that helps and saves you some $$ and time.

hotgreek

where did you get the pump from ?

marktan

Found a used one on eBay for about $200 but it was DOA, so I took it apart and used parts to rebuild my old one. I see new ones on amazon though for around $410

hotgreek

Finally after some tests it was the pump.dead I heard it was a recall couple years ago from Mercedes benz Anyone knows if still apply for my car ? 2004 S 55 with 81k ?

hotgreek

Finally I found a guy on ebay the he rebuild my pump for $95 .I will install it this weekend stay tune for results

http://cgi.ebay.com/ws/eBayISAPI.dll...m=261212066416

hotgreek

Forget it to buy new one A guy on e-bay rebuild it for $ 95 plus a relay and fuse $ 30 plus $40 labor Not bud ? right ?

http://cgi.ebay.com/ws/eBayISAPI.dll...m=261212066416