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      04-14-2015, 06:25 PM   #1
RichBZ
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Second air filter

I have a question about the air filter housing on my 2011 3.0i Z4. I am the original owner and now have 40000 miles on the car. I have changed the air filter two times so far. I remove the air filter housing from the car, open it up and remove the replaceable air filter and see a second filter. This second air filter seems to be molded into the plastic housing. So the incoming air passes thru the first (replaceable air filter) and then thru the second filter.

Now, I have watched videos on line showing a person replacing the E89 air filter and I do not see this second filter. So what is the deal with this second air filter?

Thanks Rich
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      04-15-2015, 06:29 AM   #2
elfhearse
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It's a thin charcoal air filter. I have one on my 2010 e91 Performance Intake too. Some people remove them (cut them out) but it doesn't make any difference in performance. "assume" it's protection for the MAF wire.
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      04-16-2015, 09:52 AM   #3
RichBZ
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Thanks

I left it in and it did not seem to be dirty at all.

Rich
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      04-16-2015, 10:18 AM   #4
paris1
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What's the typical change interval for an air filter on a 35i? Is there an electronic sensor which trips a service icon on the dash when the filter needs changing? My car has 25k on it and I don't know if the filter has ever been changed. I've only had it for 6 months.
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