244A00 Fault Code

Kevinwaters1998 · 04-26-2023, 09:43 AM

I have an F31 335d xdrive on 78000miles and I am experiencing a 244A00 fault code which is low boost pressure on the low power stage which is the bigger turbo of the 2. I have changed the 2 boost solenoids, most vacuum pipes and cleaned out the MAP sensor and still cannot find a cure for it. The car is running a gutted dpf delete with straight through exhaust, EGR has been mapped out and uprated intercooler installed but due to this issue the car wontt produce anymore than 340bhp but it has been mapped to run 440bhp. My next step is to smoke test the whole system to check for any leaks but if no leaks can be found then I am at a loss as my Autel diagnostic is limited to what it can do. Any help or service would be much appreciated.

Skytunep · 05-29-2023, 06:26 PM

Hi, have you got any further with this issue?
I have a 435d and changed vacuum pipes, solenoids, map sensor, swirl flaps deleted and both turbos renewed but still having underboost on big turbo while small turbo is working fine.
Regards

Kevinwaters1998 · 05-30-2023, 03:07 PM

I found that after smoke testing the PCV washer was torn snd needed changed but I've also found that it looks like the rocker cover gasket is either broken and leaking or the rocker cover itself is cracked so I need to replace both to see if that works but if I were you I'd smoke test the vaccum side and smoke test the air intake side and any leaks shoukd become evident.

04-26-2023, 09:43 AM	#1
Kevinwaters1998 Registered 0 Rep 3 Posts Drives: F31 335d BMW Join Date: Apr 2023 Location: SCOTLAND iTrader: (0)	244A00 Fault Code I have an F31 335d xdrive on 78000miles and I am experiencing a 244A00 fault code which is low boost pressure on the low power stage which is the bigger turbo of the 2. I have changed the 2 boost solenoids, most vacuum pipes and cleaned out the MAP sensor and still cannot find a cure for it. The car is running a gutted dpf delete with straight through exhaust, EGR has been mapped out and uprated intercooler installed but due to this issue the car wontt produce anymore than 340bhp but it has been mapped to run 440bhp. My next step is to smoke test the whole system to check for any leaks but if no leaks can be found then I am at a loss as my Autel diagnostic is limited to what it can do. Any help or service would be much appreciated.
	Appreciate 0 Tweet Quote

05-29-2023, 06:26 PM	#2
Skytunep Registered 0 Rep 1 Posts Drives: 435d Join Date: May 2023 Location: Belgium iTrader: (0)	Hi, have you got any further with this issue? I have a 435d and changed vacuum pipes, solenoids, map sensor, swirl flaps deleted and both turbos renewed but still having underboost on big turbo while small turbo is working fine. Regards
	Appreciate 0 Quote

05-30-2023, 03:07 PM	#3
Kevinwaters1998 Registered 0 Rep 3 Posts Drives: F31 335d BMW Join Date: Apr 2023 Location: SCOTLAND iTrader: (0)	I found that after smoke testing the PCV washer was torn snd needed changed but I've also found that it looks like the rocker cover gasket is either broken and leaking or the rocker cover itself is cracked so I need to replace both to see if that works but if I were you I'd smoke test the vaccum side and smoke test the air intake side and any leaks shoukd become evident.
	Appreciate 0 Quote