09 MCS has code P1497 and misfire.

Discussion in '2nd Generation: 2007+ R55 through R61' started by yajing, Jul 29, 2018.

  1. yajing

    yajing New Member

    Jul 29, 2018
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    Hi, I have a 2009 MCS, 60k mile. I just owned this car for 1 month but the check engine light is always on. Every day when I cold start engine, the car shakes heavily. And some times the CEL is on during starting engine, and sometimes CEL is on during driving. Using a OBD II to check it, I got code P1497/2B64 (Downstream Throttle Air Leak) as well as P300-P304 (misfire), and sometimes it shows P1338/296A (intake camshaft sensor). If I eraser the codes, the codes will appear later. I went to a local BMW repair shop (not dealer) several times to check my car, they replaced four sparks, valve cover, intake camshaft position sensor, air mass meter boot, but these code are still there. They also did smoke test three times, and found nothing leaking. Besides they told me they tested the MAF sensor and it works well. Last Friday they suggested me to do a walnut blasting treatment because they think the check engine light maybe because of carbon.
    Is there anyone have the same situation? Is there any suggestions? Thank a lot.
     
  2. wmwny

    wmwny Well-Known Member

    May 29, 2009
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    #2 wmwny, Jul 30, 2018
    Last edited: Jul 30, 2018

    Welcome to M/A! :Thumbsup:

    I have generation 1 MINIs and cannot help you but there are plenty of folk here who might have knowledgeable suggestion or two. I HAVE heard of the walnut treatment and those turbos seem prone to carbon buildup.

    Good luck!
     
  3. MCS02

    MCS02 Moderator
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    Jul 31, 2009
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    Hi @yajing welcome to MA!

    The N14 engine does have a problem with carbon build up on the intake valves due to it being a direct injection engine and the way the PVC system was designed. Change the oil every 5000 miles no longer will help. But you will have to have it blasted every so often. I believe its around 50,000 miles. give or take a little.
    At 60k I would think your car does need it done. I does cause different odd codes, will this fix it? cant say for sure but as the carbon build up gets worse the car will run worse and eventually quit running. It can even lead to a rebuild. I would have it done.
     
  4. Dave.0

    Dave.0 Helix & RMW Powered
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    Invest in walnut futures on the NYSE.
     
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  5. MCS02

    MCS02 Moderator
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    Yea, The Helmet will be getting this done soon!
     

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