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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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Old 05-10-2013, 06:18 PM
VP VP is offline
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Location: Plainfield, IL
 
Join Date: Nov 2011
Posts: 97
Mein Auto: 2003 325i
P0171, P0174 and Secondary Air System "not ready"

Hey Guys,

Been reading a lot about the codes. Can't find info on these two codes in conjunction with the Secondary Air System though. I recently did the CCV replacement, found the hose at the dipstick tube soft and collapsed. Had all kinds of misfire codes, poor idle, etc. CCV made the car run like new and idle nice and smooth. Drove a few miles with a couple of ignition cycles and scanned for codes. Found a pending P0174 and also saw three system not "ready" yet so keep driving. After about 300 miles over a few days, the MIL popped on, with a hard P0171 and of P0174 is still showing as pending. I also see, the secondary air system STILL "not ready". After about 150 miles of local, and another 150 highways miles, I am pretty sure this air system not ready is pointing me to the lean codes. Not too sure where to start though. I would have thought I would have a code specific to the air pump if it was indeed a problem ... ?
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Old 05-10-2013, 08:43 PM
The Thomas J The Thomas J is online now
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Location: Staten Island, NY
 
Join Date: Sep 2010
Posts: 33
Mein Auto: 2002 325 Cic
You have vaccum leaks. Start traceing all the hoses you tinkered with. Check the vaccum hose that comes off the fuel pressure regulator on the fuel filter which is under the car. I'm pretty sure the hard codes are the cam sensors.
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