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      06-17-2016, 02:14 PM   #1
Tworl28
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Mixture control codes

Check engine light came on and i have 2 mixture control codes.
29E0 / 29E1
Mixture control / mixture control 2
I am now getting about 16mpg instead of around 19-20avg. Car also stalls out on cold starts, but seems to run O.K. when warmed up. Seems rather sluggish
My car is a 2010 128i N51

Anyone have similar issues? Any suggestions? Haven't had too much time to diagnose this problem but I will post updates when I get to it.
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      06-19-2016, 10:35 PM   #2
ianc
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O2 sensors?

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      07-07-2016, 01:07 PM   #3
Tworl28
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I did some more research on my problem, turns out its p0171/p0174 codes. bank 1 and bank 2 LEAN. Did a smoke test but came up empty handed.
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      07-19-2016, 04:22 PM   #4
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Replaced the MAF sensor, nothing changed. Still struggling on cold start but runs fine when warm. Now getting 15mpg... This car is driving me nuts!
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      08-05-2016, 09:44 AM   #5
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Checked fuel pressure and it tested very low (3.5 bar) so I'm thinking fuel pump or pressure regulator. I dropped my 1er at BMW on tuesday and they informed me its a fuel delivery issue. They will be replacing my fuel tank 100% covered under SULEV warranty. WHEW! Thought all hope was lost! BMW really came through for me here
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