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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Sat, Jul-24-2010, 03:38:32 AM   #1
ALwAyS4SaLe
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Default OBDII Code P1434/BMW Code 176

What these codes mean: Diagnostic Module Tank Leakage Malfunction

Reason: Apparently this happens with age, so therefore you will eventually have to replace it. Otherwise, the SES light will just keep coming back on. I cleared it 4 to 5 times and it seems like everytime after 500 miles or so the SES light comes back. I took it to VAC motorsports, they had no clue what this code means as they never encountered it before. I did some research on the forum and found that it might be the DMTL pump that failed. Therefore I replaced it, its fairly easy, but the part is fairly inexpensive. The dealer will attempt to charge you $350 dollars for it. SO I did it myself, took probably an hour. Unfortunately I didn't have a camera to do DIY, but if I can do it (not mechanically inclined) you can too.

Part #: 16 13 7 193 479 Tischer BMW
Price: $132.38
Tools: Ratchet with 8mm socket/T20 socket

DMTL pump:
Located under the Black plastic cover right behind the exhaust. It has a total of about 9 / 8mm screws (3 on the exhaust heat shield, 1 on the bottom of the cover, 4 screw caps around the cover coming from the car, and 1 connect to a splash guard near the passenger wheel). Take the cover off and the the DMTL pump is held on by 3 T20 screws (Don't be alarmed if the pump you see on the car is all black and the part you got from BMW is half black and half white, I guess that's just a newer version.). Once the screws are off, then you take off the sensor from the back of the pump held on by clips on each side. Then on the side, there is a large black tube that goes into the pump which is held on by a clip and you unclip that as well. The last part of the pump is fitted into the EVAP canister by a rubber fitting, all you have to do is just wease it out. FYI, take pump that you purchased does not have the rubber fitting therefore, you take the rubber fitting from the old pump and fit it on the new pump. After that you reverse installation and you're done and clear the code on the car. I actually just installed it today and I will update this if this solves the problem. Hopefully this helps as a DIY, but again I apologize if I couldn't provide pictures, but its fairly easy.
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Old Sat, Aug-28-2010, 05:56:12 AM   #2
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My problems are fixed and MPG has possibly gotten a little better since this has been fixed.
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Old Wed, Sep-22-2010, 03:34:11 PM   #3
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hi,

was your code P1434?

Why is that when i took it to autozone some shops read it "secondary air pump relay issue"?

did you experience anything different when driving with the SES light on? what are the symptoms?

mine just went off couple days ago after being on for 6-7 weeks. i had autozone clear it out of my computer and i hope to get it back so i can re-scan it to confirm P1434.
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Old Sat, Sep-25-2010, 05:32:53 PM   #4
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I got a code P1448 which is similar to this issue I believe. OP can you verify?
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Old Fri, Aug-12-2011, 12:17:19 AM   #5
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Default Re: OBDII Code P1434/BMW Code 176

OP can you tell us what your symptoms were when the pump went out?
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Old Wed, Dec-14-2011, 01:40:06 AM   #6
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Default Re: OBDII Code P1434/BMW Code 176

where did you get the part
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Old Wed, Dec-14-2011, 01:58:09 AM   #7
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Default Re: OBDII Code P1434/BMW Code 176

i got the part from tischer.... Sorry for the late replies, but I had no symptoms other than the SES light coming on that was it.
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Old Wed, Dec-14-2011, 02:06:31 AM   #8
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Default Re: OBDII Code P1434/BMW Code 176

tischer?
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Old Fri, Jul-06-2012, 08:45:53 AM   #9
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Default Re: OBDII Code P1434/BMW Code 176

Hello, I'm having a cold start issue on my 2003 M3, after a month I've got SES with p1434. On cold engine starts difficultly but after runs normally, could this replacement solve a problem?
Thanks
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Old Mon, Apr-01-2013, 10:14:02 PM   #10
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Default Re: OBDII Code P1434/BMW Code 176

I want to say they are related since you're not the first person to claim that they are having cold start issues with the above fault codes. I'm experiencing similar cold start problems and have the same pump fault code come on every 200 to 500 miles, so just wanted to verify if replacing the tank/canister solve your issue?

Amir
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Discussing Torque Spec thread in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)