01 BMW 325i is giving me codes P0491 P0492 and P0014

Tiny
BCMULLEN95
  • MEMBER
  • 2001 BMW 325I
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 187,000 MILES
We bought the car recently and discovered it has problems. I have replaced o2 sensors the vacuum pump and breather valve. While I was testing the old vacuum pump I had only thhe p0492 and p0491 codes showing up the vacuum pump randomly quit working and then the p0014 code showed up. What do I need to do to help resovle this so I can get it to pass emissions?
Thursday, May 28th, 2015 AT 9:23 PM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
Hello Bcmullen95,

Those codes are for the secondary air injection system which could be may things such as an air diverter valve or air check valve at the exhaust manifold. I found this resource that might help, please let me know who it goes.

http://www.bimmerfest.com/forums/showthread.php?t=430048

Best, Ken
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Tuesday, June 2nd, 2015 AT 5:01 PM
Tiny
BCMULLEN95
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  • 249 POSTS
So I checked out the Web site and followed what I could and I just had the code p0492 pop up again. I replaced the solenoid valve and vacuum lines. Could the check valve by the exhaust manifold causing this problem? Do you know what the exact drive cycle is.
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Friday, June 26th, 2015 AT 5:59 PM
Tiny
KEN L
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Hi Bcmullen95,

Yes the check valve could easily cause the problem you are having, the drive cycle will vary as the computer goes through its monitored systems.

Let me know how it goes :-)

Best, Ken
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Saturday, June 27th, 2015 AT 9:14 AM
Tiny
BCMULLEN95
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Do you know what the drive cycle for the 01 BMW 325i drive cycle is? I find ones online I just want to make sure it is accurate.
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Wednesday, July 1st, 2015 AT 7:22 AM
Tiny
KEN L
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HI Bcmullen95,

The cycle will usually complete within 30 to 50 miles.

Best, Ken
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Wednesday, July 1st, 2015 AT 9:59 AM
Tiny
BCMULLEN95
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  • 249 POSTS
Not for this car, we have driven almost 300 miles for it to complete a drive cycle. If I have the correct drive cycle I can just follow the BMW drive cycle to complete it instead of guess work. Do you know the 01 BMW 325i drive cycle?
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Wednesday, July 1st, 2015 AT 10:59 AM
Tiny
KEN L
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Hi Bcmullen95,

That cycle is way too long, it must not be completing which can be caused by the engine not running at operating temperature like the thermostat is stuck open, can you check?

Best, Ken
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Wednesday, July 1st, 2015 AT 2:06 PM

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