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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N55 Turbo Engine Tuning and Exhaust Modifications - 335i Tuning > Help diagnose and fix codes n55: 2C57 and 28A0



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      07-17-2024, 04:08 PM   #1
gabewardd
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Help diagnose and fix codes n55: 2C57 and 28A0

- [ ] 2c57 Charging pressure control, plausibility pressure too low
- [ ] 28A0 throttle valve opening absolute pressure intake pipe pressure too high

Hello everyone,
Over the summer I set a goal to fix all my codes. These are the last two and I’m super excited to fix them. I read a few forums about 2C57 being a possible boost leak or something so I got the boost pressure solenoid. I’m having trouble finding tutorials on how to install? I also have a valve cover gasket leak and I read that could be a problem too. Please let me know thanks!
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      07-29-2024, 08:25 PM   #2
david769
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Had same 2c57 swapped out https://www.fcpeuro.com/products/bmw...id-11747626350 went away
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      08-06-2024, 04:34 AM   #3
wrevilo
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Maybe smoke test the intake system to see if there are any air leaks?
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