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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 02-15-2005, 10:27 AM   #1 (permalink)
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Hey bro's. Check engine light came on today so I took it to autozone this morning to have the code read. It read "P1423" "auxilary emissions". The guy said the number is high meaning he couldn't tell me what it meant, and that only the dealers keep info on more car specific codes this high. Can anyone help here?

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Old 02-15-2005, 11:08 AM   #2 (permalink)
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Originally posted by RIBEMR26@Feb 15 2005, 10:27 AM
Hey bro's.* Check engine light came on today so I took it to autozone this morning to have the code read.* It read "P1423" "auxilary emissions".* The guy said the number is high meaning he couldn't tell me what it meant, and that only the dealers keep info on more car specific codes this high.* Can anyone help here?


[snapback]292285[/snapback]
P1423 secondary air system (bank 1).
start by checking the air pump, non return valve and associated hoses and vacuum lines. Next make sure that the front o2 sensor is within range. HTH

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Old 02-15-2005, 11:37 AM   #3 (permalink)
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Thanks Steve -

What do you mean about the O2 sensor being "within range" and how would I check that? This doesn't seem like something I could do myself....
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Old 02-15-2005, 01:09 PM   #4 (permalink)
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Hey AutoTechnica...

Is this stuff that I can check on my own...without special tools???
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Old 02-15-2005, 06:28 PM   #5 (permalink)
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Quick bump for the night shift...see if anyone has any ideas....I searched around and read that the most common reason for this is apparently the non-return valve? Can anyone help me out with some details around exactly what this part is...is it a part of the air pump?
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Old 02-16-2005, 02:46 PM   #6 (permalink)
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Originally posted by RIBEMR26@Feb 15 2005, 06:28 PM
Quick bump for the night shift...see if anyone has any ideas....I searched around and read that the most common reason for this is apparently the non-return valve? Can anyone help me out with some details around exactly what this part is...is it a part of the air pump?
[snapback]292530[/snapback]
part of the air pump system. Located on the exhaust manifold. Common failure part, pull the hose off of it and check inside with a mirror somtimes they get clogged with carbon.

pull the other end of the hose off(connected to the air pump) if water comes out of it replace the pump, valve and reset the light and take the car on a nice ride to make sure it doesn't reset. If you need any help...email

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Old 02-16-2005, 04:09 PM   #7 (permalink)
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Thats the info I was looking for...thanks for the help Steve...

I would rather diagnose the actual problem before just replacing parts....the valve is only like $100....a new secondary air pump is like $250.....
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