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E63 / E64 6 Series (2003 - 2013)
The E63/E64 BMW 6 Series builds on BMW's sporty heritage with aggressive lines and an incredible motor to back the design up. Available in coupe and convertible trims with a standard 4.8 liter engine producing 360 horsepower and 360 lb-ft of torque, the 6-series is a popular choice that exceeds expectations.

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  #1  
Old 10-24-2012, 04:58 PM
dawg1 dawg1 is offline
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Fault Code Help p0491

I have "increased emissions" fault code p0491 ( secondary air pump bank 1). I took it to a shop and they said it could be all types of things. I really would like a more specific diagnosis if at all possible. They did mention changing a part with valves and and a piece of tubing but "that might not be it". Does anyone know what should replaced and where it's at? I can't find any links to photos of this stuff.

On a side note, my car just started stalling and shutting off when warm and idling at a stop light. As soon as you hit the gas from the stoplight it cuts off. It's not everytime. The fault code has been on longer than this issue so I guess they are not related but wanted to ask.

Thanks for any input.
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  #2  
Old 10-24-2012, 06:26 PM
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Yorgi Yorgi is offline
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Read these two threads. It's a common issue.

Weird Noise/Rattle at Start up

Increased emissions warning??????
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  #3  
Old 10-25-2012, 05:00 AM
dawg1 dawg1 is offline
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In those posts people were saying all types of different things. I don't have a weird noise. Others said carbon buildup -- costs 10k?! All of this sounds a bit sketchy. I guess it isn't an easy fix afterall. Guess I'll have to live with it.

Last edited by dawg1; 10-25-2012 at 05:05 AM.
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Old 10-25-2012, 04:45 PM
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Yorgi Yorgi is offline
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Increased Emissions is a catch all message. Something is preventing the engine from completely burning all the fuel during combustion. It can be anything from a dirty air intake filter, worn plugs, bad CCV, a vacuum leak, dead sensor, dirty MAF, worn out O2 sensor, etc.....Probably over 100 things can cause that message.

The best thing to do is scan for codes, which might help you find the cause. Sometimes you don't get code though so you need to start checking each of the various systems that can cause the error.
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Old 10-25-2012, 05:29 PM
dawg1 dawg1 is offline
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Yeah it's code p0491 -- Secondary air pump, bank1. From what I've read it could be the bank 1 valve and/or the hoses that run under the manifold (which I understand is very hard to ever get to). I've also seen posts where people changed the valve, hoses, and pump and still had the code. I don't know if it's worth trying to fix. I just want the light off. Sounds like a potentially huge deal. Is it usually just the valve or impossible to tell?
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Old 10-25-2012, 06:59 PM
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I was not paying attention to what I was replying to in my previous post, forgot you had a code already.

That code is pretty much 100% accurate. Your pump or hose is bad. It's a lot of work to get to and based on the other threads about $700 to fix.
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Old 10-25-2012, 07:34 PM
HerbP HerbP is offline
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What part of Georgia are you in? I am down in Augusta, & could possibly help you narrow down the problem with DIS. There is a guy over in the 7 series forum that had some success clearing the tubes in the heads by soaking & using some wire as a drill bit to clear the air passage. As long as you are not in Atlanta & don't have to pass an emission test, you should be able to drive the car without a problem.

If you where to replace the valve & hose under the intake, it might be a good time to replace the coolant pipe while you were in that area.


Good Luck!
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  #8  
Old 10-26-2012, 02:13 PM
dawg1 dawg1 is offline
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HerbP,
Hi. I'm in Savannah. Your reply mentions cleaning out ports(?). How do you know if it's that versus just needing a hose or valve?

Yorgi,
You mention the code means pump or hose (?). Did you mean divert valve or hose? I thought if the pump was bad it would cause both bank codes to set off??
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  #9  
Old 10-26-2012, 05:40 PM
HerbP HerbP is offline
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Here is a thread from the 7 series forum discussing your code. It is not the thread that was discussing cleaning the air passage, but might help you some. I will see if I can find the other thread. I don't hangout in the 7 series that much anymore.

Good Luck!

http://www.bimmerfest.com/forums/sho...d.php?t=536156
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  #10  
Old 10-26-2012, 11:11 PM
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Yorgi Yorgi is offline
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Quote:
Originally Posted by dawg1 View Post
...Yorgi,
You mention the code means pump or hose (?). Did you mean divert valve or hose? I thought if the pump was bad it would cause both bank codes to set off??
Yes, I mean the diverter valve at the back of the engine (circled in red in the 7 series thread photo linked above)

Regardless, getting to that pipe is a very big job. Take at look at this DIY .PDF. You need to do the steps from page 1 to page 22 to get to the diverter. If I was in there I would probably do the coolant pipe (ie finish the rest of the DIY in the .PDF ~$1K in parts) and change the diverters and hoses while I was at it.
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Straight lines are for fast cars...turns are for fast drivers
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'02 Highlander - kid hauler
'01 330Ci - winter beater


Last edited by Yorgi; 10-26-2012 at 11:14 PM.
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  #11  
Old 11-09-2012, 08:11 PM
dawg1 dawg1 is offline
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...so if I have parts 1 (y pressure hose) and 8 (valve) replaced, there's a very good chance I will resolve code p0491? Just want to double-check before I spend the money. Are there any other parts in that diagram (hose 9 for instance) that should be replaced?

Thanks.
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  #12  
Old 11-10-2012, 06:28 PM
HerbP HerbP is offline
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The code indicates that you have air flow problems on one side, but it's hard to say if you will resolve the problem? If you use DIS or INPA to test the system with known test, you might have a better answer.

Good Luck!
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Old 11-11-2012, 05:24 PM
dawg1 dawg1 is offline
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So I really need to find someone with that software? Is that something only the dealer will have or are they common? The software would say specifically what is wrong?
Thanks.
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  #14  
Old 11-12-2012, 09:15 AM
HerbP HerbP is offline
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Quote:
Originally Posted by dawg1 View Post
So I really need to find someone with that software? Is that something only the dealer will have or are they common? The software would say specifically what is wrong?
Thanks.
The software will help you run the needed test to help pinpoint the problem. It could be the valve, the Y piece, the secondary air pump, or possible blocked air passage. You should be able to find an INDY that could run the test.

Good Luck!
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Old 01-02-2013, 05:09 PM
dawg1 dawg1 is offline
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NEW development. I still haven't gotten my p0491 code fixed yet -- mainly to the cost involved to get to that hose and valve. BUT now I have a loud, grinding (?) type sound at startup that lasts 40-45 secs or so. It then stops, car is running fine. Is this the secondary air pump? I'm gonna have to get this fixed as it's so loud. If it is this pump, where is it located exactly? I'm not willing to try to take that intake manifold off but can I get to this pump more easily? I cannot tell from the sound where it is. Maybe I could get lucky and this fix my code (even though I only had a code from bank 1). Also, could that bank 1 valve under the intake be stuck and cause this pump to fail (in other words, can just the pump be replaced without fear of the new one getting ruined)? Can I disable it rather than replace? Isn't there a fuse?

Here's a video/sound:

Last edited by dawg1; 01-02-2013 at 06:04 PM.
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  #16  
Old 01-02-2013, 07:03 PM
HerbP HerbP is offline
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That is definitely coming from the secondary air pump. It only runs for to 1st 20 to 45 seconds. It could be the pump, or the diverter valve. There should be plenty of threads like this on the 7 series forum.

Good Luck
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  #17  
Old 01-02-2013, 07:11 PM
dawg1 dawg1 is offline
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Herb - where is the pump located?
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Old 01-02-2013, 07:28 PM
HerbP HerbP is offline
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Without access to the online TIS that BMW AG had shutdown, I pretty sure it is on the passenger side in front of the fender skirt. Trace your air hoses down to the pump. I have a copy of TIS, but I will have to locate it.

Last edited by HerbP; 01-02-2013 at 07:43 PM.
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  #19  
Old 01-03-2013, 12:38 PM
dawg1 dawg1 is offline
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If I'm looking at the right thing, from above I think I can see the top of the pump. It looks like you take off the passenger tire and wheel well to get to it. Does that sound correct?
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Old 01-04-2013, 02:27 PM
dawg1 dawg1 is offline
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Update: To access the secondary air pump I did have to remove the passenger tire and pull back the wheel well. The sound from my youtube video isn't coming from the pump but when I disconnect it, the sound stops. I now believe it is the pipe under the manifold. I guess it was cracked initially (causing the p0491 code) but now is much larger causing the loud noise. Does this sound right?

In this thread below the writer has a 7 series and was able to access the air pump bank 1 valve and shove a new pipe under the manifold without removing it. The engines look the same. If I take off all that black plastic holding the cabin filters, I wonder if I can do the same? Does anyone know for certain?

http://www.bimmerfest.com/forums/sho...d.php?t=557050
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