OK...this is getting frustrating!! I have doneseries of checks and can't seem to get the check engine light to go off. I get a generic error code P410 - secondary air system. I changed the air pump andcleared the code. came back on after driving for appro 20 miles.

Anyone have this code comeup for another reason?
What should I look for next?
Does anyone know what circuit the pump is on? Is there a fuse or relay that can be checked an trace an electircial problem back to the pump?

Please Help!!

 

Maybe this can help you, I came across this

AIR INJECTION PUMP/CHECK ENGINE LIGHT, up to chassis no.A077841: check engine light illuminates after a succession of repeated cold starts, replace the air injection pump, 000 140 37 85, and the air injection pump relay (K28), 002 542 26 19
BODY:-163
25M/98-2 GROUP 14 -ALL M-CLASS MODELS UP TO CHASSIS NO. A077841, AIR INJECTION PUMP/CHECK ENGINE LIGHT ILLUMINATION: If a vehicle's check engine light illuminates after a succession of repeated cold starts, it is possible that the air injection pump may have been damaged. In this case, please replace the air injection pump, part no. 000 140 37 85, and the air injection pump relay (K28), part no. 002 542 26 19. For warranty cases, please use Damage Code 14349

 

Thanks.....where is the air injection pump relay (K28), part no. 002 542 26 19 located?

 

in the fuse box driver side under hood, should be a fuse and relay chart under the fuse box lid

 

DA...OK...found it. It looks like #K28. What isthe best way to go about testing it?

 

swap it with another relay is easiest. when there is a cold start
that air pump should switch on for about a minute.

 

does you car fall into that VIN range as the bulletin said?

 

Yep....I have #A060679. I changed the relay today and noticed the 40 Amp fuse was also blown......I did not noticeif this just happened or if it was like that the entire time.....SoI changed that as well. I started the car and still did not hear the pump kick on...not sure how distinct it would sound if it did. Check enginge light did not go off, so I cleared the code and will see if the light comes back on after the computer has a chance to reset itself.

I'll keep you posted. Thanks for the input. It has been a huge help!