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Go Back   E46Fanatics > Tuning & Tech > Driveline, Engine & DME Tuning

Driveline, Engine & DME Tuning
Talk about driveline improvements, NA tuning and DME tuning your E46 BMW here. This includes diffs, intakes, exhausts, chips, software and OBD tuning.

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Old 09-13-2009, 01:44 PM   #1
Hinman
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Join Date: May 2009
Location: Pensacola, Florida
Posts: 230
My Ride: e30/ e46
Question Bank #2 Too lean?

this is the code i got when i ran a code reader on my car when the service engine light came on. a mechanic at the local shop i take my car to said it isnt a huge deal to deal with right now (he said that maybe 3 months ago). my service engine light comes on and off a lot more now, and its starting to worry me a little. apparently it something to do with the fuel injection/ trim? i'm not to sure to be honest.

is this something i should get replaced asap? or is it something me and my dad could manage to pull off?
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Old 09-13-2009, 07:25 PM   #2
JB_ZHP
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Could be a crack in your lower intake boot, very common problem on our cars. It's about a $12-15 part you can replace in under an hour.
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Old 09-15-2009, 09:31 PM   #3
sirch
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Join Date: Dec 2008
Location: Colorado
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I have the same problem as well.

Replaced the lower intake boot as Hinman suggested as it did have a crack.

DIY Replaced o2 sensors.

Dealer reprogrammed ecu.

I still have the same problem but now the dealer wants to change the o2 sensors because I orginally replaced them 3 months ago.

I'm thinking that it is a vacuum leak coming from somewhere??? Any other suggestions?
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Old 09-15-2009, 09:52 PM   #4
sirch
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Just thought I would add some information.

Recently change fuel filter.

Currently have the car hooked up to the computer and I'm getting range in the o2 sensor 1 in bank one and two but o2 sensor 2 in bank and one and two are pretty steady at around .45.

Intake air at 134 deg F. MAF air flow at 3.71 gm/sec. throttle pos sensor at 10.2%.
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Old 10-14-2009, 01:02 PM   #5
Hinman
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okay, so i replaced the lower intake boot about 2 weeks ago, and it did have 2 big cracks in it. the service engine light came on again today, with the same problem any suggestions now?
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Old 10-14-2009, 01:55 PM   #6
Kole
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I had a similar problem with my X5. I don't know if it could what is going on with you or not. I was getting lean codes and it turned out to be my mass air flow sensor. I tried cleaning the MAF but didn't work, so I replaced it. I then had to reset the trim values because they had maxed out trying to compensate for incorrect mass air flow signals. Wish you luck.
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Old 10-24-2009, 02:20 AM   #7
bluesolara
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how do u reset trim values??
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Old 11-08-2009, 03:26 PM   #8
rickxs619
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the real solution

Adjuster unit 1 11617544805 $212.50 +core i hade the same proble and i replace alot of parts my code was system too lean after i replace this problem was solve no more codes or wired noises on front of the engine by the manifold
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