330D Fault Code HELP!

E36Jacob · 08-11-2022, 12:40 PM

Hello all, I bought my 2006 E90 BMW 330D (M57) with a supposed 368horsepower however the car feels stock, I have all the necessary modifications for at least 400hp now so just needs a tune. I need some help with fault codes that I have found with INPA.

Error code - 4587, clogged fuel filter. I think this is a self explanatory fix so I will be ordering and fitting a new fuel filter.

Error code - 4A27, intelligent battery sensor. Not sure why this has come up as battery runs and starts brilliantly so I will ignore as it doesn't affect car performance.

Error code - 41AA, boost pressure sensor. This is the main thing I want to sort out; some people say its the MAF sensor while some say its the MAP sensor. Some people also say this can come from a dodgy map which is what I think as well. Is it worth replacing both the MAF and MAP sensors? Or could it be a problem with the turbo?

Last error code is 3F25, charge air hose monitoring, people say this could be a problem with my intercooler piping as it could be split. I did notice that I could hear a sort of leak when the foot was down, at first I thought it was at a certain rpm of 3000 but seems to be whenever you put the foot down and not rpm related; I also thought it was an exhaust leak as I did hit the exhaust hangar on a gate-stopper. But this fault code leads me to believe its not an exhaust leak. Any help would be appreciated, cheers!

lnxguy · 08-12-2022, 01:55 PM

The MAF doesn't detect boost, the MAP does. Sounds like you've got a massive boost leak.

compressionignition · 08-13-2022, 01:49 PM

If you have access to a smoke test machine you can apply pressurized smoke to the system to look for any leaks from the intercooler or charge pipes. If not there are a few good tutorials on YouTube for how to make your own smoke tester at home with a soldering iron and bicycle pump. Best way to identify a boost leak. If you have access to ista/inpa there is a way to see data on battery registration. The intelligent battery sensor can throw weird faults sometimes if you have replaced a battery and not registered the replacement in the dme.

08-11-2022, 12:40 PM	#1
E36Jacob New Member 1 Rep 8 Posts Drives: BMW 330D Join Date: Aug 2021 Location: Bristol iTrader: (0)	330D Fault Code HELP! Hello all, I bought my 2006 E90 BMW 330D (M57) with a supposed 368horsepower however the car feels stock, I have all the necessary modifications for at least 400hp now so just needs a tune. I need some help with fault codes that I have found with INPA. Error code - 4587, clogged fuel filter. I think this is a self explanatory fix so I will be ordering and fitting a new fuel filter. Error code - 4A27, intelligent battery sensor. Not sure why this has come up as battery runs and starts brilliantly so I will ignore as it doesn't affect car performance. Error code - 41AA, boost pressure sensor. This is the main thing I want to sort out; some people say its the MAF sensor while some say its the MAP sensor. Some people also say this can come from a dodgy map which is what I think as well. Is it worth replacing both the MAF and MAP sensors? Or could it be a problem with the turbo? Last error code is 3F25, charge air hose monitoring, people say this could be a problem with my intercooler piping as it could be split. I did notice that I could hear a sort of leak when the foot was down, at first I thought it was at a certain rpm of 3000 but seems to be whenever you put the foot down and not rpm related; I also thought it was an exhaust leak as I did hit the exhaust hangar on a gate-stopper. But this fault code leads me to believe its not an exhaust leak. Any help would be appreciated, cheers!
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08-12-2022, 01:55 PM	#2
lnxguy Lieutenant Colonel 357 Rep 1,723 Posts Drives: 2009 335D Join Date: Jun 2016 Location: Barrie iTrader: (1)	The MAF doesn't detect boost, the MAP does. Sounds like you've got a massive boost leak. __________________ '09 335D
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08-13-2022, 01:49 PM	#3
compressionignition New Member 11 Rep 23 Posts Drives: 2011 335d Join Date: Jul 2022 Location: Atlanta, GA iTrader: (0)	If you have access to a smoke test machine you can apply pressurized smoke to the system to look for any leaks from the intercooler or charge pipes. If not there are a few good tutorials on YouTube for how to make your own smoke tester at home with a soldering iron and bicycle pump. Best way to identify a boost leak. If you have access to ista/inpa there is a way to see data on battery registration. The intelligent battery sensor can throw weird faults sometimes if you have replaced a battery and not registered the replacement in the dme.
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