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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 09-04-2013, 03:09 PM
camnco camnco is offline
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Location: Missouri
 
Join Date: Sep 2013
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Mein Auto: 2007 750 Li
Need Exhaust Help

Hello All, New Member here and I have an issue,

My 2007 BMW 750Li was bottomed out by my wife! ouch!! It seemed to be running fine, but then the engine light came on. I took it to the dealer and they happily informed me the bank 2 catalytic converter was damaged and that it has sensors in it that recognize the damage and will not go off till replaced. I don't want to pay the $3000 for them to replace them if I can do it with a possible upgrade for less. Does anyone know what the Bank 2 catalytic converter is/where it is and how I might handle this??

Thanks CAM
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  #2  
Old 09-04-2013, 03:17 PM
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SuperSnoop SuperSnoop is offline
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Location: Austin, Texas
 
Join Date: Aug 2012
Posts: 559
Mein Auto: 2007 760Li
Need Exhaust Help

Did they say the cat was damaged and needed to be replaced, or just the sensors? There should be two oxygen sensors, one on either side of the cat.


If it needs a cat, Take it to a muffler shop to have the cat replaced.


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  #3  
Old 09-04-2013, 06:14 PM
camnco camnco is offline
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Location: Missouri
 
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Mein Auto: 2007 750 Li
They just said the bank 2 catalytic converter. Never mentioned the oxygen sensors. No telling with them.
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  #4  
Old 09-06-2013, 08:59 AM
gkent gkent is offline
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Location: Dallas, Tx
 
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Mein Auto: 2006 E65 750i
The downstream (post-cat) O2 sensors are the ones analyzing your catalytic convertor efficiency. You're probably getting an OBD code P0430 (or BMW tool reporting 29F5).

I guess it's possible that the bottoming out impacted the exhaust pipes which jolted the bank 2 (drivers side) cat enough to break the honeycomb structure inside ....

See here for pics:
http://www.realoem.com/bmw/partgrp.d...475&hg=18#1810

BMW only offers the exhaust manifold (w/ attached cat) replacement, $1200 each. Pain to get to. Some have reported success with muffler shops using generic cats, if they will even touch it.
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  #5  
Old 09-23-2013, 03:23 PM
camnco camnco is offline
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Location: Missouri
 
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Mein Auto: 2007 750 Li
I've seen aftermarket Magna Flow Catalytic converters on Ebay. Has anyone had any luck with those? Thanks CAM
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  #6  
Old 09-23-2013, 03:23 PM
camnco camnco is offline
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gkent, thanks for the great info. CAM
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  #7  
Old 09-24-2013, 01:33 PM
Nonlkethis Nonlkethis is offline
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Location: Virginia
 
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Mein Auto: 2008750li
Try AAAmufflers.com and ask for Phil
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  #8  
Old 09-26-2013, 10:54 AM
ssdriver27 ssdriver27 is offline
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Location: Washington
 
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Mein Auto: 2003 745LI Alpine White
you have many options when replacing Cats. doesnt mean they are generic. I would definitely take it to an exhaust shop and simply have the cat replaced dynomax or magnaflow would be a good replacement and most any shop would do it however Id stick to a reputable shop and have both done at the same time dont only change one side and if the light is still on after that look at replacing the O2 sensors. WAY less expensive then 3,000.00, thats crazy talk.
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  #9  
Old 09-26-2013, 12:34 PM
kjruben kjruben is offline
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Location: SD, CA
 
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Mein Auto: BMW 760Li V12
It's not that easy to change our cats as they are one unit with the exhasut manifold. Most shops won't even touch it. If you can find a shop that is willing to do it and has done it suceesfully it will definately save you alot of money.
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