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7 Series - E65 / E66 (2002 - 2008)
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  #1  
Old 09-26-2011, 06:53 AM
italiano italiano is offline
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P0491 engine code how screwed am I?

Guys I have a 03 745li with 85k on the dash and the code p0491 secondary air injection system bank 1 came up. I'm freaking out because the guy at advanced auto said that it's a huge problem. I can't find any info on it, please guys anything you guys can tell me because this is making my Monday even worse.
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  #2  
Old 09-26-2011, 07:53 AM
Bendare2 Bendare2 is offline
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Read this: http://www.bimmerfest.com/forums/sho...d.php?t=176213

Looks like something you can DIY if you want... the thread has a mix of 5-series and 7-series reporting the same issue. Could be as simple as a hose fitting or changing out the check valve.
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  #3  
Old 09-26-2011, 08:05 AM
italiano italiano is offline
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Thank you so much, it seems more for the 5 series I don't know how close it will be for the 7s. Still confused on it with the 7.
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Old 09-26-2011, 08:12 AM
Bendare2 Bendare2 is offline
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According to the thread posts, the 7-series secondary air pump is behind the right fog light. That pump will look something like this:



Check the hose connection for any kind of leak.
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  #5  
Old 09-26-2011, 08:33 AM
italiano italiano is offline
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Awesome thank you.
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  #6  
Old 09-26-2011, 04:54 PM
italiano italiano is offline
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To get to it you think I will have to remove the bumper or get to it underneath the car? Trying to get a time estimate on the job. I called the dealership to see If they would give me insight and he told me that we don't use p codes here we have our own diagnostic and I'd have to bring it in for a look. So they can bait me in for $3,000 forget that I hope I can solve this myself
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  #7  
Old 09-26-2011, 05:09 PM
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MOPAULY MOPAULY is offline
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A. Let the dealer properly diagnose it and then decide if you want to repair yourself.

B. Most auto parts store monkeys don't know their way around the store let alone an $85k car
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Old 09-26-2011, 06:01 PM
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Seven11 Seven11 is offline
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Quote:
Originally Posted by MOPAULY View Post
A. Let the dealer properly diagnose it and then decide if you want to repair yourself.

B. Most auto parts store monkeys don't know their way around the store let alone an $85k car
perfect advice right there

or if u dont want to take it to the dealer, i suggest u find a great indy that knows these cars or at least that worked on BMWs before
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Old 09-28-2011, 08:57 PM
italiano italiano is offline
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Ok so I took the cover off of the passenger side and this is a picture of the secondary air pump from underneath (I think). I can only see from underneath it and just follow the one hose. How can I acess the other hoses I don't think you can get to it from the top of the engine. Please any help would be great.

Last edited by italiano; 09-28-2011 at 08:58 PM.
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  #10  
Old 09-29-2011, 06:36 AM
italiano italiano is offline
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Does anyone know if I have to take off the bumper to be able to get to the other hoses on this secondary air pump. I posted the picture from underneath the car which had no access to anything. No one has ever had this problem there is not really any info on the web to address this.
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Old 09-29-2011, 08:01 AM
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I think mine was changed under warrty, sorry i couldnt be more help. I guess look where the hoses go and make your decision from there.
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  #12  
Old 09-29-2011, 11:00 AM
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If your going to work on this car at least get the TIS off of eBay - without it you won't be able to do much...properly anyway.
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Old 05-29-2013, 05:51 PM
edwartj edwartj is offline
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P0491 engine code how screwed am I?

Quote:
Originally Posted by italiano View Post
Does anyone know if I have to take off the bumper to be able to get to the other hoses on this secondary air pump. I posted the picture from underneath the car which had no access to anything. No one has ever had this problem there is not really any info on the web to address this.
Do you have an update on this... I'm trying not to start a new thread since your issue is on the p codes are my exact issue!! Thx!!


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  #14  
Old 05-31-2013, 06:38 PM
edwartj edwartj is offline
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Anybody out there... I need help on these codes p0491/2
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  #15  
Old 06-01-2013, 12:01 AM
mokh mokh is offline
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p0491

hey there

i had this error a while ago and to tell u the truth it was a bit of a pain to fix. there are 2 problems associated with the secondary air system. one has to do with the pump itself, and another has to do with the hoses and valves.
the pump issue costs more in parts than in labor and vice versa for the hoses and valves :S

first thing u have to do is to run the pump and check if its working. u can do that in inpa without removing anything at first. run the secondary air pump test in inpa and listen to it if its working or....its quite audible if the engine is off.

if the pump is working, which was my case, then i'm sorry to tell you that you have a problem with the hoses or the valves. the valves are located at the back of the engine and the hoses run from the pump, under the manifold, to the valves. if either is faulty then you have to remove the entire manifold to get to them. that in itself is not quite a hard task if you know what you're doing. it should take a skilled mechanic around 40 mins to 1 hr to do the job. remember that you also have to change the manifold gasket once you remove it because no matter in what condition it is....it will leak air if you install it back in

i've attached a couple of pics with the manifold removed and the hoses and highlighted the valves.

hope this helps!
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  #16  
Old 06-01-2013, 12:15 AM
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roadfrog roadfrog is offline
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This has been covered at length over and over. Do a search.

In summary, your air ports are clogged in your engine. All German Auto has recently released a kit which allows you to clean these ports, potentially saving you thousands of dollars:
https://www.agacoolantpipe.com/produ...ry-air-cleaner

There's some youtube videos of them demonstrating how it works.
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