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3-Series (E46, E90) Chat relating to the BMW 3-Series from 1999 to Current. Models include: BMW 316i, BMW 318i, BMW 318Ci, BMW 320i, BMW 323i, BMW 325i, BMW 330i, BMW 328 Ci, BMW 328i, BMW 325i/xi, BMW 330Ci, BMW 320d, BMW 330d, BMW 335d.

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Old 09-30-2009, 09:42 AM   #1 (permalink)
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P0171&P0174 codes pop up. anyone have a clue??

so im going to need an inspection in january and my car still has these two codes that pop up:
P0171-BANK 1 SYSTEM TOO LEAN (it could be bank 2)

P0174-BANK 2 SYSTEM TOO LEAN (it could be bank 1)

i cant remember too well which was bank 1 or 2. now, when i initially found these codes, it was before we replaced the crank case ventilation valve. im curious if those codes had to do anything with the ccv. we replaced the ccv ourselves because BMW was going to charge me $880 and when they gave me the order form that they were going to use to order the parts (saying it was the ccv), it didnt even include a ccv. it included a "pressure regulator" and some tubes and hoses.

OKAY, sorry.. now my QUESTION is: is there a way i can clear those codes? or would i really need a new pressure regulator according to those codes..?

ive googled as much info as i could on those two codes and i see millions of different things on fuel injectors and so on and so forth. it never says "this is what is wrong with your car" and unfortunately, i dont trust bmw enough to leave my car in their hands again.
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Old 09-30-2009, 09:51 AM   #2 (permalink)
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If the codes were not cleared after you replaced the CCV they will always appear until the are erased from the ECU.
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Old 09-30-2009, 10:09 AM   #3 (permalink)
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is there a way to clear them myself? if yes, how?
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Old 09-30-2009, 12:08 PM   #4 (permalink)
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I don't think there is, it has to be diagnostics I'm afraid....if you are doing your own servicing etc, its worth investing in Carsoft diagnostic leads,software and a laptop, sounds a nightmare but all quite cheap off eBay etc, if you require guidance on what to buy etc send me a PM.
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Old 11-02-2009, 05:19 PM   #5 (permalink)
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Take a look here...

Hi CCT,

Try Peake Research <http://www.peakeresearch.com/> They make a beautiful, easy to use reader / eraser for about as much as you would pay for a scan only at the dealer... I own one and love it!

Have fun and let me know how it works.

Greg
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