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Old 08-14-2002, 07:33 PM
Registered User
Join Date: Dec 2001
Location: Rocklin CA
Posts: 65
Where do all the filters go?

S500 96

I would like to know all the filter locations and how to replace them. I have already done the following

Oil Filter
Engine Air Filters
HVAC filter(over the blower moter) 140 835 01 47

I will leave the trasmission filter to the mechanics.

There seems to be another couple of filters referenced in several threads.

Cabin Charcoal Filter? $300 bucks 140 830 00 18

ACC cabin filter ? Fastlane reference $20.00

140 835 02 47 Circulating Air Filter

Which ones do I need? Where are they? and can I replace them?

Ken G
96 S500 79K (great white whale)
98 E430 80K Sports Package (gray ghost)
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Old 08-14-2002, 09:12 PM
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JCE JCE is offline
Down to the Wear Bars
Join Date: May 1999
Location: So Kalifornia
Posts: 2,189
This Bosch filter site lists the filters on the German model S class as being behind the glove box. (Click on 'vehicle specific installation' button at bottom of page.) Some older threads on searching for 'Cabin Filter' indicate that there may be an additional charcol cannister filter?

Maybe a US 140 owner can kick in.

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
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Old 08-14-2002, 11:07 PM
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Join Date: Mar 2001
Location: Evansville WI
Posts: 9,616
Interesting (and confusing!) topic.
First you need to know if your car is equipped with the charcoal filter system.
It used to be on the older 140's you could tell by looking at the hood, it had the "slots" running across the back part of the hood, the non-charcoal had no slots, just a flat steel hood. Later they must have decided the slots were "cool" as they put the slotted hood on all models, charcoal or not. The best way to tell for sure is to look for the charcoal switch on the dash, maybe someone can post a picture of what the emblem looks like, or check your owners manual.

WITH charcoal filter system, you have the following filters
*recirculation filter, costs more like 10 bucks, even at a dealer. It's underneath the dash on the passengers side, kind of a trick to remove it.
*charcoal system pre-filter, costs a couple hundred bucks, maybe less now, it's in the underhood area above the blower motor.
*charcoal filter, costs, last time I had to replace one, $466 at a dealer. It's in the dead center of the firewall. The wiper system needs to be removed along with the rain tray, then a vacuum pump is used to "deflate" one of it's seals so it can be removed, very tricky.
On the life of these things, I believe its recirc filter every 15,000 miles, charcoal prefilter every 45,000 miles, charcoal filter every 75,000 miles.

WITHOUT charcoal there is only 2 filters:
*recirculation filter same as above
*dust filter, costs I think $20, we don't see many 140's without the charcoal system. It's the same shape and location as the charcoal pre-filter noted above, but is a simple paper element, the charcoal prefilter does have a charcoal covering on the botton part of it. Also the normal dust filter has a hard plastic frame around the element and the charcoal pre-filter is like a rubber frame. If you are sensitive to pollen and so forth I would think a "poor mans" charcoal system could be created by replacing a dust filter with the charcoal pre-filter, assuming your 140 doesn't have the charcoal system.
I believe the service interval on a non-charcoal system is to do both every 15,000 miles.

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Old 08-15-2002, 06:19 PM
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Join Date: Dec 2001
Location: Rocklin CA
Posts: 65
Thanks, mine does have the charcoal system and now I know where they are. I will give the one on the passanger side a try. The one behind the firewall seems like a job for a pro if its once every 75K.

Ken G
96 S500 79K (great white whale)
98 E430 80K Sports Package (gray ghost)
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