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General E46 Forum
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Old 04-28-2009, 11:39 PM   #1
Bobk528
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Secondary air pump system P0491 and P0492

Last November the Check Engine light appeared on a 2001 325Ci and the diagnostic code reader displayed P0491 and P0492. An independent mechanic replaced the secondary air pump, air valve, electric control valve, and rubber hose at a total cost of $1,050.

After the mechanic cleared the codes, the car ran for 1 day before the Engine light and same codes (P0491 and P0492) returned.

The Check Engine remained on until the mechanic recently searched a BMW bulletin board and determined that the problem was isolated to the non-return valve, which is part number 11611312737. According to Bav Auto, the part cost $16.95 but this small plastic piece looks like it only costs 5 cents. So far the Check Engine light has not returned. If you receive a P0491 and/or P0492 code, you may want to first look into replacing a $17 part.
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Old 04-30-2009, 12:06 AM   #2
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Thanks for the tip! I just happened to pull those two codes, plus a couple others. Although my SAP is bad (sounds like a vacuum cleaner), but it is good to know what else to watch out for.

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Old 05-25-2009, 02:34 PM   #3
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Will look into this!
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Old 05-25-2009, 05:13 PM   #4
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ifl
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Old 06-08-2009, 12:15 AM   #5
xi_ter
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I've been getting the CELs too and replaced my valve today. The area is tight to hand access, so I removed the intake cover, the cabin air filter housing and a shield around the brake reservoir. I also decided to replace the hose going into the white/black non-return valve.



DiceyOne removed his cover and his pic shows the connections the the valve from the bottom. Thanks, good for orienting.

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Old 06-17-2009, 11:06 PM   #6
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The same codes returned. I checked the fuses located in the glove compartment and found the 50amp fuse for the secondary air pump had blown. I went to AutoZone to purchase a $3 fuse, erased the codes with my diagnostic code reader and the "Check Engine" light has not turned on for over one week.
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Old 06-18-2009, 12:05 AM   #7
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I have been having trouble with these codes too and now I'm gonna look into this. Thanks for the heads up. I'm sorry it cost you so much money.
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Old 03-01-2012, 06:34 PM   #8
jskin1510
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welll i've been searching and searching and it sounds like from these two codes you can possibly have one or multiple reasons why these codes come up.. anything from a fuse, to any vaccum leak in the secondary air system, to failure of any individual part/component of this system as well. Why does this have to be so complicated... sorry venting a little because i was hoping i could narrow down possibilities by researching first, well I guess i'll just start with the cheapest fixes first and go from there...
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Old 08-29-2012, 09:31 AM   #9
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My SES light just came on the other day and I got the famous P0492 problem. I guess the first thing I will do is also start with the cheapest (check/replace the fuse).
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Old 08-29-2012, 09:53 AM   #10
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I also found this thread if anyone is having this code come up...

http://www.bimmerfest.com/forums/sho...d.php?t=430048
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Old 08-29-2012, 11:21 AM   #11
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My SES code popped on a few weeks ago with the P0491 and P0492 codes. There is a small vacuum line that runs around the rear of the intake manifold along the valve cover to the SAP that I had accidentally broken a couple months ago while replacing my valve cover gasket.

I replaced the broken portion of the line with some Autozone vacuum hose (cost maybe $1), cleared the code and it hasnít returned since. First things first, I'd say inspect that line for breaks (especially if you've moved it recently - it can be pretty brittle). I experienced no drivability issues while my SES light was on...
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Old 08-29-2012, 11:26 AM   #12
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Thanks for that information, Key. I have a question for you. Did you have to remove the SAP in order to find that broken line?
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