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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 12-01-2009, 06:22 PM   #1
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P0491 & p0492

My car has these codes and an SES light
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Old 12-01-2009, 06:23 PM   #2
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I replaced both hoses near the pump and valve cleared the codes and they came back a day later... It seems to run quietly for about a min in the morning though.
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Old 12-03-2009, 06:59 PM   #3
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I just checked the salmon colored Relay behind the glove box and it looked new inside...
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Old 12-05-2009, 07:35 PM   #4
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Please have a look at the article in my signature titled "Is your check engine light on?" BMW maintains a separate, factory programmed diagnostic system that dealers and techs use for actual repair work.

Using a generic OBDII tool (which yielded those P codes) may yield misleading information. Often, a group of chassis-specific BMW factory codes are represented by a single OBDII code Start with the factory codes.

Start with the codes that are meant for your BMW.

ken@bimmertools.com if you have any questions about the article or the Peake Research non-OBDII, BMW-specific scan tools we represent.

Good luck,

Ken
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Old 04-29-2010, 09:11 PM   #5
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Did you ever fix the problem? and if so what'd you do?
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Old 04-29-2010, 10:09 PM   #6
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Mine ended up having a bad Air Pump, it was locked up, so I broke it free but it still wouldn't run. I bought a used one off of a guy on here and it works great!
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Old 04-29-2010, 10:23 PM   #7
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Ah i see...

This is the 2nd time the light came on.. the first time it came on for about a day or two and then came off. That was about 2 weeks ago... This time it seems like its staying on.
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Old 04-29-2010, 10:38 PM   #8
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Diagnose Follow this link, it will help you diagnose your issue.
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Old 04-29-2010, 10:41 PM   #9
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wow awesome link, thanks!
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