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      06-18-2019, 03:53 PM   #4
oakey46
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Drives: BMW 2 A/T 220i Lux Auto 1.5
Join Date: Jan 2018
Location: England

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Quote:
Originally Posted by Skyline2.0 View Post
I may be stating the obvious, but try changing the cabin air filters. 20k miles on the original filters is a good amount of time/distance if they haven't been replaced before. It's a huge PITA to get to compared to many other cars, but do-able with a bit of flexibility and patience. Installing new filters should be much easier than getting the old ones out.
I think that would only filter out any incoming air/odours from outside, whereas the type of odour mentioned is most likely coming from the heater/cooler matrix where microbes will have become active and produced the stink. Cabin air filters are also a standard service replacement item, although I cannot recall the time interval frequency (the service schedule booklet is locked in my car for the night!).
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