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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

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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  #1  
Old 12-05-2014, 10:41 PM
jadyn2021 jadyn2021 is offline
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Location: WA State
 
Join Date: Jul 2014
Posts: 78
Mein Auto: 2003 325i Sedan
Wink Any tricks to passing emissions test with a bank 1 too lean code ?

So, tabs are due. Bank 1 too lean is no where near fixed, time and money wise.

I've gotten away last few years resetting the computer and doing whatever tricks i could think of, but i think they were just luck. Now it is becoming a set hardfault at less than 40 miles after reset.

Any magic tricks are welcomed!



oh, 2003 325i
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  #2  
Old 12-06-2014, 06:53 AM
marcozandrini marcozandrini is offline
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Mein Auto:
You have a vacuum leak. Have the intake smoke tested.
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  #3  
Old 12-06-2014, 09:43 AM
Kautiongsr Kautiongsr is offline
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Location: Downey
 
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Mein Auto: 335is bmws1000rr
Most likely crank vent valve
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  #4  
Old 12-06-2014, 09:47 AM
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floydarogers floydarogers is offline
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Location: Renton, WA
 
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Mein Auto: 335d, 328d, Toyota T100
Quote:
Originally Posted by marcozandrini View Post
You have a vacuum leak. Have the intake smoke tested.
This. +

A couple words of caution: even if you get the thing fixed, it's going to be a week or two before your car's ECU will be "ready", as it takes miles/hours - often 200 miles or so - to convince the ECU the problem is fixed.
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Old 12-06-2014, 12:52 PM
Bigsean123 Bigsean123 is offline
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It dosent takes weeks. I don't have the link but if you reset it Google drive cycle. It's like
1 cold crank let idle for 2 min
2 drive to safe road and get to 55mph at about half throttle stay at 55 for 2 min then slow all the way down to 20 mph without touching the brake so coast to it.

Anyways that not perfectly it but a simple Google search will explain the proper procedure. I found one for GM cars and I did it to mine and mine was ready after 50 miles.
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  #6  
Old 12-06-2014, 08:16 PM
jadyn2021 jadyn2021 is offline
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Location: WA State
 
Join Date: Jul 2014
Posts: 78
Mein Auto: 2003 325i Sedan
i think i'll combine this http://www.bimmerboard.com/members/q...ve%20Cycle.jpg

with some extra octane additive.

I passed like that last year, although then i didn't know the exact drive cycle, but the octane seems to have done it last year.

Any thoughts ?
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  #7  
Old 12-07-2014, 02:52 PM
wilt wilt is offline
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Location: SF Bay area
 
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Mein Auto: 2011 328i
I don't know about WA, but here in CA the smog check stations will refuse to test your car if dash warning light indicates something not right with emissions/fuel mixture.
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  #8  
Old 12-08-2014, 11:28 AM
_sub _sub is offline
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Location: Queens, NY
 
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Mein Auto: E46 2001 325i
These codes are a pain in the ass, trying to fix as we speak.

Replaced upper and lower intake boot (after the mass airflow sensor.)

Still getting codes.

Smoke tested at a friend's shop and found a huge leak coming from the Vacuum Control Valve... hoping that's the end of that.
Part: 5
REAL OEM LINK

Smoke testing is definitely the way to go though; quickest way to check where the leak is coming from.

I've read people having vacuum leaks from tears in the boots, DISA valve, Disa Valve Seals, Head gasket Seals, Vacuum hoses, CranCase Vent Valve (or hoses hoses within the ccv network).



If you're trying to get passed without fixing the issue your best bet is clearing the code, completing the drive cycle and getting it inspected before the SES light comes on.

Best of luck
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