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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Shuttering on startup & sometimes on freeway



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      02-07-2013, 11:56 AM   #1
AltecBX
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Exclamation Shuttering on startup & sometimes on freeway

So every time I start the car I get ECU codes: P2CAB & P2CA7. Occasionally I also get P2DED, H2CAB & H2C3E with the codes above. I have remove the tune I had installed, and wondering what could it be. This happens all the times when starting the car and sometimes it happens on the freeway especially when I accelerate quickly.

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      02-07-2013, 12:23 PM   #2
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P2CAB and P2CA7=lambda/precat o2 sensors, my car threw the same two codes when mine went bad a few months back. The car will start to misfire on cold start and generally drive poorly, which makes perfect sense seeing as how it'll have a tough time getting AFRs correct. If you're under warranty just take it in (unmodded obviously), if not, O2 sensors aren't too brutal from a cost standpoint. Any competent shop can take care of it quickly.
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      02-07-2013, 12:28 PM   #3
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Thanks. I read your post on this before posting this question. The reason I posted this up, is because I also get the other codes as well and it happens on the highway as well.
Where can I get a pair of O2 sensors for a good value as I'm out of warranty?
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      02-07-2013, 05:03 PM   #4
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Quote:
Originally Posted by AltecBX View Post
Thanks. I read your post on this before posting this question. The reason I posted this up, is because I also get the other codes as well and it happens on the highway as well.
Where can I get a pair of O2 sensors for a good value as I'm out of warranty?
I'll check around when I get home, but Turner Motorsports and ECS are two good OE part suppliers that come off the top of my head. Mine was replaced under CPO, but I considered just buying one myself to avoid removing the mods. TBH I'm not sure what the other codes are..
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      02-08-2013, 10:36 AM   #5
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Thanks.
So are ppl suggesting these codes has to do with replacing the O2 sensors?
What about getting the BMS Downpipe Fix? Do you guys think this can fix the problem?
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      02-08-2013, 11:07 AM   #6
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Quote:
Originally Posted by AltecBX View Post
Thanks.
So are ppl suggesting these codes has to do with replacing the O2 sensors?
What about getting the BMS Downpipe Fix? Do you guys think this can fix the problem?
The first two codes mean your precat o2s are not reading correctly, which almost always means they're fried. To my knowledge, replacing the faulty part is the only way around that code. The DPfix is used by forum members to pass emissions testing, it is not advised to drive around with it on for long periods of time. If you are tuned the tune should have an autoclear mode that would get rid of the CEL from your catless downpipes, but that has nothing to do with O2 sensors possibly biting the dust. IF your precat O2s are bad, you need to replace them, there's no way I know of to cover up the issue.
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