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MazdaSpeed 3/6 - Troubleshoot/Diagnostics MazdaSpeed 3/6 - Troubleshoot/Diagnostics - Have a problem with the car? CEL Code? Want to discuss other issues? Come on in!


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 Old 02-16-2010, 06:19 PM   #1
 
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Default Intermittent P2187 Code after K&N Filter Install

Hello Everyone. Ever since I installed a K&N Drop in Filter a month ago on my 2009 MS3, I have been getting an on and off P2187 Code (System Lean at Idle). The odd thing is that the code comes and goes. It will come on when idling at a light and then 4 or 5 days later will go away after enough engine cycles. I reset the ECU thinking that maybe the computer just had to relearn with the new filter but it came back within a few days of that.

Any thoughts on why this is happening? Should I just ditch the K&N filter and go back to the stock paper filters? I've noticed a slight increase in fuel mileage with the new filter but don't want to do anything that screws up the car.

I'm still under warranty so I was going to take it to the dealer but I figured they would just blame it on the K&N filter and do nothing but charge me for it.

Thanks for the help on this.
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 Old 02-16-2010, 06:28 PM   #2
 
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you have a leak somewhere after your mass air flow sensor.
double check all your clamps (including the inlet pipe to turbo).
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 Old 02-16-2010, 06:34 PM   #3
 
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It's likely your K&N had a ton of oil on it and has fouled the MAF... Get some electrical parts cleaner and clean the MAF and you'll be good for a while, but as long as your running an oiled filter, expect to have to clean the MAF every month or two..
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 Old 02-16-2010, 07:04 PM   #4
 
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Thanks for the replies. I will go ahead and check for leaks as well as get some electrical parts cleaner and clean the MAF. I'm wondering if the limited benefits of the K&N filter are worth the hassle or if I should just go back to paper filters.
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 Old 02-16-2010, 07:41 PM   #5
 
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I'd keep the K&N.. It only takes a minute to clean the MAF.
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 Old 02-21-2010, 08:36 PM   #6
 
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Thanks for the help on this. I cleaned the MAF sensor yesterday and have been driving around a fair amount and the car feels much better and also no CEL. The idle seems to have smoothed out considerably.
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 Old 09-11-2012, 12:21 PM   #7
 
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I have a Mazda cx7, anyone know what
I have to do to get rid of the 2187 code?? I checked
The connections and cleaned the MAF still won't go
off. Ive installed a cpe cai,cpe catback and ets tmic. Got a
Feeling it needs more fuel at idle anyone know how to fix? It started after I installed the tmic
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 Old 09-11-2012, 12:26 PM   #8
 
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my bpv was leaking, replaced with stock and it fixed my issue
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