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Robbo, is this after fitting K&N filter elements in the stock airbox or full monty K&N cone filters (and binning the original airbox - like I've done)? Either way, I'd be amazed if there was a problem that could be traced back to the filter.

On the BMW forums I visit (one in the UK, one US based) there are literally hundreds of people who've replaced their air intake with some form of cone filter arrangement (not necessarily K&N) and I've never seen a single mention of MAF (Mass Air Flow) sensors getting fouled up. I suppose it might be a problem if you over-oiled the filter after cleaning it and excess oil got on the MAF sensor wire, but that can be avoided.

Well, a very quick Google revealed the following thread on an MB forum:
http://forums.mbworld.org/forums/showthread.php?p=880039#post880039

....and here's the pertinent quote:

So, it was a problem on the Merc and no problem at all on a BMW M5. FYI, my intake is a replica "GruppeM" unit.

Michael.

<blockquote data-quote="michaelab" data-source="post: 571605" data-attributes="member: 1011">Robbo, is this after fitting K&amp;N filter elements in the stock airbox or full monty K&amp;N cone filters (and binning the original airbox - like I've done)?&nbsp; Either way, I'd be amazed if there was a problem that could be traced back to the filter.On the BMW forums I visit (one in the UK, one US based) there are literally hundreds of people who've replaced their air intake with some form of cone filter arrangement (not necessarily K&amp;N) and I've never seen a single mention of MAF (Mass Air Flow) sensors getting fouled up.&nbsp; I suppose it might be a problem if you over-oiled the filter after cleaning it and excess oil got on the MAF sensor wire, but that can be avoided.&nbsp; Well, a very quick Google revealed the following thread on an MB forum:<a href="http://forums.mbworld.org/forums/showthread.php?p=880039#post880039" target="_blank">http://forums.mbworld.org/forums/showthread.php?p=880039#post880039</a>....and here's the pertinent quote:So, it was a problem on the Merc and no problem at all on a BMW M5.&nbsp; FYI, my intake is a replica &quot;GruppeM&quot; unit.Michael.</blockquote>

[QUOTE="michaelab, post: 571605, member: 1011"] Robbo, is this after fitting K&N filter elements in the stock airbox or full monty K&N cone filters (and binning the original airbox - like I've done)? Either way, I'd be amazed if there was a problem that could be traced back to the filter. On the BMW forums I visit (one in the UK, one US based) there are literally hundreds of people who've replaced their air intake with some form of cone filter arrangement (not necessarily K&N) and I've never seen a single mention of MAF (Mass Air Flow) sensors getting fouled up. I suppose it might be a problem if you over-oiled the filter after cleaning it and excess oil got on the MAF sensor wire, but that can be avoided. Well, a very quick Google revealed the following thread on an MB forum: [URL]http://forums.mbworld.org/forums/showthread.php?p=880039#post880039[/URL] ....and here's the pertinent quote: So, it was a problem on the Merc and no problem at all on a BMW M5. FYI, my intake is a replica "GruppeM" unit. Michael. [/QUOTE]

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