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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > NA Engine (non-turbo) / Drivetrain / Exhaust Modifications > N51 valve cover replacement P0174 code after.



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      02-23-2017, 02:58 PM   #1
bmw201113
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N51 valve cover replacement P0174 code after.

Hey everyone so i replaced my valve cover on my N51 328i coupe and when i started the car the service engine soon light came on. The codes were P00BC,P0171,P0174. Its saying something about the system being to lean in bank 1 and bank 2. Was wondering if anyone knew where i should look for first to try to get these codes cleared, as well as if anyone may have ecountered similar codes on their valve cover replacement.
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      02-23-2017, 03:12 PM   #2
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could it be the PCV hose at the back of the engine cracked? Did you replace it when you had the cover done? It's almost impossible to remove without breaking.
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      02-23-2017, 03:51 PM   #3
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I didnt replace it but ill look into it i did manage to remove it pretty gently everything else looks to be uniform and properly connected
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      02-23-2017, 04:27 PM   #4
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The thing is it can break/crack and you wouldn't even know. It's wrapped in heat trace, shrink wrap and insulation, so even if it's broken it still holds its shape.
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      02-23-2017, 05:09 PM   #5
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Ok ur probably right i trust ur opinion i know u know ur stuff just sux because thier is another 5 hours of labor
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      02-23-2017, 05:12 PM   #6
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Take off the weather stripping and it comes out easy, but you can do it in 2 if you push it
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      02-23-2017, 05:31 PM   #7
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I would have it smoke tested before spending 5 hours tearing it all apart again
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      02-23-2017, 05:47 PM   #8
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I would have it smoke tested before spending 5 hours tearing it all apart again
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      02-23-2017, 06:08 PM   #9
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For sure just wish bmw would think smarter honestly they do it on purpose for extra money
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      02-23-2017, 06:52 PM   #10
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Quote:
Originally Posted by bmw201113 View Post
For sure just wish bmw would think smarter honestly they do it on purpose for extra money
Not attacking you but the mechanics don't do it on purpose. That's a common thing to break when removing the valve cover gasket or intake manifold. When mechanics break something on someone's car they own up to it and replace them right away, trust me I used to work at BMW. The last thing they want is a car they worked on to come back for the same repair. Accidents happen.
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      02-23-2017, 07:36 PM   #11
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Ok so i cleaned my maf sensor with cleaner and the code turned off i drove around for ten minutes and the code came back on. Also while at stop light idling my car was acting like it wants to stall out but never fully did kinda lost about now smh.
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      02-23-2017, 07:37 PM   #12
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Guna grt smoke test done tommorow done messing with car today
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      02-25-2017, 01:32 AM   #13
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So the codes went away when i started the car and its been driving fine all day. Any chance that the vehicle just needed to adapt? I read the n51 is more complex as well as more fidgity after such repairs are made due to additional systems
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