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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 > Problems with n54 335i



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      02-04-2014, 01:27 PM   #1
Biely
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Problems with n54 335i

Greetings from Belarus!

The problem is like this - check engine regularly appears on the panel. Consumption increases, reduced dynamics, sometimes raises the idle speed or just shaking a little. I have two errors - lambda before catalyst (mixture too rich) and after the catalyst (mixture too lean). Both lambda in the first bank. No more mistakes. Exacerbated if the ride is very active.

Any ideas what's wrong? The catalyst?
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      02-04-2014, 01:55 PM   #2
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o2 sensors?
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      02-04-2014, 02:27 PM   #3
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No, they are working quite good. I've tried to install different ones - the same issue.
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      02-04-2014, 02:58 PM   #4
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Switched sensors after a downpipe install? Sorry, not an expert just seem that question answered for similar issues.
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      02-04-2014, 03:26 PM   #5
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I have stock pipes with cats.
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      02-04-2014, 07:33 PM   #6
dlbrooks18
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Scan car for codes and post up, could be a number of things..
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      02-04-2014, 08:53 PM   #7
Miller335
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Could be many things.
O2's, one of your cats, a misfire due to plugs/coils/injectors throwing things off.
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      02-04-2014, 09:35 PM   #8
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Are you using 91 or better fuel? Also you mentioned downpipes, did the check engine light begin after the downpipes?
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      02-06-2014, 04:25 PM   #9
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Using only 95 fuel. I have no downpipes. I have stock pipes with cats.

As I said before I have two errors - lambda before catalyst (mixture too rich) and after the catalyst (mixture too lean). Both lambda in the first bank. No more mistakes.
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      02-07-2014, 02:46 PM   #10
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It sounds like the places for the o2 sensors are switched on bank one
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