e60 545i check engine code P0491
06-14-2012 | 10:28 AM
#11
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Joined: Mar 2011
Posts: 12
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From: tacoma
I drove pretty "spirited for over a year on the z4. Clearing like every week because I can't stand dash msgs
06-14-2012 | 08:41 PM
#14
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Joined: Jul 2008
Posts: 4,410
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From: Chicago
I had this problem on my M54 engine. I had the tube / valve replaced and decided NOT to replace the secondary air pump at all. It does whine on cold starts for about 5-10 seconds and I could care less. It hasn't failed yet and I won't replace it until it does. Even then, I don't need it unless I HAVE to pass emissions.
Funny thing about the loud noise on start, too.... My friend was like, "dude, what is that?" I said, "oh, it's the supercharger winding up." His reply, "wow, that is badass!"
I really had to hold back from laughing.
Funny thing about the loud noise on start, too.... My friend was like, "dude, what is that?" I said, "oh, it's the supercharger winding up." His reply, "wow, that is badass!"
I really had to hold back from laughing.
06-15-2012 | 04:24 PM
#15
Senior Members
Joined: Feb 2009
Posts: 555
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From: DFW, TX
My Ride: '04 545i, sport pkg, premium sound, sprint booster,
I've been having this problem for the last few months. Everything was replaced, car runs fine. So I'm guessing there is a loose connection to the pump? Difficulty for checking this?
06-17-2012 | 02:14 PM
#16
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Joined: Mar 2011
Posts: 12
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From: tacoma
Its not too difficult but you have to disconnect a lot of connectors before you can get to the pump. Give yourself 4 to 5 hours if this is your first time
06-17-2012 | 02:24 PM
#17
Senior Members
Joined: Jun 2009
Posts: 2,680
Likes: 7
My Ride: E60 530i
I had this problem on my M54 engine. I had the tube / valve replaced and decided NOT to replace the secondary air pump at all. It does whine on cold starts for about 5-10 seconds and I could care less. It hasn't failed yet and I won't replace it until it does. Even then, I don't need it unless I HAVE to pass emissions.
Funny thing about the loud noise on start, too.... My friend was like, "dude, what is that?" I said, "oh, it's the supercharger winding up." His reply, "wow, that is badass!"
I really had to hold back from laughing.
Funny thing about the loud noise on start, too.... My friend was like, "dude, what is that?" I said, "oh, it's the supercharger winding up." His reply, "wow, that is badass!"
I really had to hold back from laughing.
06-28-2012 | 04:36 PM
#18
New Members
Joined: Jun 2012
Posts: 1
Likes: 0
From: Abingdon Maryland
My code is p0492. The 1st post by the guy named the newbie has a 1 at the end. I'm gussing one is right and the other left. But wich one. Before I got the code checked I looked at my pcv and the left side was ripped. Then when I felt proud of the easy fix I got kicked in the balls with a unrelated code.
