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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 06-14-2013, 12:59 AM   #1
tmr931
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Join Date: Jan 2013
Location: ohio
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My Ride: 330ci
p0173 code

I have a p0173 on a 2000 323ci. what are some possible causes?

I believe this is a rich condition. from doing a search, i am thinking its a bad 02 sensor. Can anyone confirm that? Does this car have 2 o2 sensors?
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Old 06-14-2013, 02:26 AM   #2
dznuts007
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http://www.obd-codes.com/p0173

This might help. Mentions a few possiblities such as:
Vacuum leaks
Possible bad O2 sensors
Dirty MAF
Bad CCV or hoses - This guy solved his P0173 by changing out the CCV hose (http://www.e46fanatics.com/forum/sho...d.php?t=799653)
Other stuff

Easy stuff to start off with is to take out your boots and carefully examine them for rips, especially around the ribbed areas (sometimes hard to see if you don't take them out). While you have them out, clean out your ICV and Throttle body, or you'll have to take out the boots again if you do it at a later time.

Clean the MAF with CRC MAF cleaner (don't use brake cleaning fluid or throttle body cleaning fluid like some people do. Can potentially mess up your MAF)

Check your DISA gasket and replace the gasket with an oring (was it MJLavelle that sells it for like $3?)

Your car should have 4 O2 sensors. 2 pre-cat and 2 post-cat sensors. What year is your car and how many miles? Depending on that might want to change out your O2 sensors anyways. (autohausaz.com, bmaautoparts.com and other websites have some pretty good pricing on them)

Look into checking your fuel pressure at the Schrader valve on the fuel rail (Autozone rents out the fuel pressure tester for free) and possibly replace your fuel filter
Oh, and remember to plug your MAF back in after you take out your boots. I seem to have a problem forgetting to reconnect it every time after working on the car and always get the SES light and always facepalming...

These are things that would be good for maintenance anyways. Have fun!
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Old 06-14-2013, 07:09 AM   #3
jfoj
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http://forum.e46fanatics.com/showthr...6&highlight=50

http://forum.e46fanatics.com/showthread.php?t=929501
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299

Last edited by jfoj; 06-14-2013 at 07:10 AM.
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Old 06-14-2013, 07:24 AM   #4
bostonsthename
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I had this and my DISA was broken
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Old 06-14-2013, 10:38 AM   #5
tmr931
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good info, thanks guys

my understanding though is that if an intake boot is torn, it would cause a lean condition, not rich? is that correct?
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Old 06-15-2013, 12:52 PM   #6
jfoj
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My Ride: '06 330CiC, '03 M5
Re: p0173 code

Forget what the code states, BMW/Bentley had the codes mixed up and even had the same code listed as both rich & lean. Most cars never run rich, almost impossible with fuel injection or very rare.

Likely you have either a crankcase or intake air leak somewhere.
__________________
Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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