E-Class (W210) 1995-2002: E 200, E 220D, E 240, E 290TD, E 300TD, E 200, E 240, E 280, E 320, E 420, E 430 (Wagon, Touring, 4Matic)

Fuse and relay location for secondary air pump (smog pump) 2001 E430

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Old 08-26-2014, 08:51 PM
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Fuse and relay location for secondary air pump (smog pump) 2001 E430

Hi everyone,

I got a p0410 code on my car and from what Ive read its related to the secondary air pump, or I guess also known as the smog pump.

I ran power directly to the air pump and it works.

I replaced some cracked vacuum hoses, but that didn't do the trick either.

I would like to check the related fuse and relay, but I have no idea where they are located or labeled as.

Anyone with some insight?

Thanks
Old 08-27-2014, 06:44 AM
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210 55
Ok first of all, when you start the car in the morning the air pump starts? or not

If not, check some fuses and relays in the control units box (under hood, passenger side, unscrew 4 little screws)

If the pump starts when cold startup you need to check for a cloged EGR or the 2 vaccums located at sides of the air pump.

Fabio Daniel

Last edited by Fabio D; 08-27-2014 at 06:47 AM.
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Old 08-27-2014, 10:48 AM
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@Fabio D

Any idea which fuse and/or relay it is, in that box you mention?

Thanks
Old 08-27-2014, 02:00 PM
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1999 E300TD
Your ECU provides the voltage instructions to the secondary air pump(M33) relay K40/4k3 and the circuit is fused with K40/4f7(40amp maxi fuse)

Both are located within the passenger side fuse and relay box.

The maxi fuse will be easy to identify---the relays are oriented in the following fashion k1 k3 k2---remember you are looking for k3
Old 08-27-2014, 04:56 PM
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@Plutoe Thanks for the info, ill have a look later tonight.

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