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Secondary Air Injection System

Car = 99' bmw 540i
I just got a new check engine problem, OBD II shows P0491 and P0492 which are Secondary Air Injection System Bank 1 and 2.

Does anyone know what this is and what I should do??

Any help would be appreciated.

Thanks to all

Old 02-26-2003, 11:06 AM
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We have a similar issue w/ our 1998 528i.
There is a 'Secondary Air' pump, electricaly driven that blows fresh air into the exhaust system, it does this to help burn remaining hydrocarbons that did not burn during the combustion process. this results in cleaner exhaust. look in you owners manual to see what fuse/relay controls this pump. if the fuse/relay is OK then check to see if there is power at the plug that goes into the pump. If there is no power at the plug, then that is where I would think the problem is.
If there is power at the plug then it looks like the pump is the problem. In our car the air pump is located in the front passenger side corner of the car, yours may be different. Also on our car there is a rubber hose that connects to a metal manifold that in turn connects to exhaust banks 1& 2. bank 1 is cyl 1-3 and bank 2 is cyl 4-6, yours is probably left side of engine and right side of engine.

Hope this helps.
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Old 02-16-2007, 07:10 AM
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"IF" he still has the car. LOL

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Old 02-16-2007, 11:09 AM
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what mj said is correct, the only other possibility is that heads could be clogged but since it is both sides it is most likely not the cause. check the vaccum hose going to the valve in the front and if it has holes replace it. if not check the power like mentioned above
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Old 02-27-2007, 04:03 PM
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secondary air

Thanks for the info. Can you tell me more about the vacuum hose going to the valve in the front? We are chasing a similar problem on a '98 528i.

Thanks!

MJ & JJ
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Old 03-02-2007, 12:58 PM
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mj & jj that is a totaly different engine, no related air lines to the valve
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Old 03-07-2007, 09:52 AM
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Air pump

Mj &jj

....i'm having a similar problem,97 528i......... is the pump located under the right front corner of the engine bay....accessed from the wheel well ? any pics?

Thanks
Kevin
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Old 04-03-2007, 07:51 AM
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Here's what it looks like.

http://www.realoem.com/bmw/showparts.do?model=DD63&mospid=47585&btnr=11_2350&hg=11&fg=50

You should be able to follow the tube from the exhaust manifold back to the pump. Or at a cold start listen for the 'hairdryer'.

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Old 04-03-2007, 08:11 AM
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