New MAP sensor. Still getting Boost pressure sensor signal interruption code

smass · 03-30-2016, 10:07 AM

Boost pressure sensor signal interruption oKurzschluss to earth Code: 003F01. That is my only code. It comes back after a couple of days after I clear it.

It's an 09 X5 35d w/ 44k miles. I replaced the MAP sensor last month. It hesitates while accelerating gently. In addition to the sensor I have changed all vacuum hose, actuators, and the red boost hose. I pulled the manifold last week and there was not a ton of CBU. Any ideas what I should check next? Could Rheingold help?

The sensor wires directly to the ECMs so I don't think there is a ground connection point to check. I suppose there is a chance the new sensor is also bad. That is a easy $70 check. I checked ground with my volt meter and it shows as good even when I wiggle the pigtail of wire around. Thanks

Hoooper · 03-30-2016, 04:00 PM

All the information on this code suggests its either the MAP sensor which you already replaced, or EGR failure (CBU??). Thats all based on older models though.

smass · 03-30-2016, 06:50 PM

Here is what the front EGR looks like. The E70 has a 2nd EGR by the turbos that I have not checked yet.

BB_cuda · 03-31-2016, 10:50 PM

Smassey, that looks like the older style of hi press EGR valve. Reason I recognize it is the inward protruding boss on the left. I had the recall done and the EGR isn't made like this anymore. I got another used EGR valve so that I could machine out its throat and this one looked same as yours prior to me hacking it into a smooth throat. I will double check.

That said, X5 hi press valve could be different and similar in design to obsolete 335d valve.

Did you have the recall work done?

smass · 04-01-2016, 11:14 AM

Quote:

Originally Posted by BB_cuda

Smassey, that looks like the older style of hi press EGR valve. Reason I recognize it is the inward protruding boss on the left. I had the recall done and the EGR isn't made like this anymore. I got another used EGR valve so that I could machine out its throat and this one looked same as yours prior to me hacking it into a smooth throat. I will double check.

That said, X5 hi press valve could be different and similar in design to obsolete 335d valve.

Did you have the recall work done?

This is the best picture I could find of old vs new EGR. I think it is new but I am not 100% sure. There are no records of it being changed. 1/09 build date. Thanks

BB_cuda · 04-01-2016, 03:59 PM

I'm sorry. I messed up. Your valve is the updated one. I have a picture of my updated valve. It matches the #1 in your attached illustration. Indeed, your #2 was what I hacked up for my "straight through" valve. Second pic is a side by side of old "throat cleared" valve and updated one. And sorry again for pulling off track. My bad. I don't have picture of old valve before surgery began.

03-30-2016, 10:07 AM	#1
smass Lieutenant Colonel 430 Rep 1,607 Posts Drives: 2010 335i 8 speed Join Date: Sep 2010 Location: Scottsdale, AZ iTrader: (1) Garage List 2010 E90 335i [0.00] 2016 F15 35i [0.00] 2003 E53 3.0 [0.00] 2006 E90 325i [0.00]	New MAP sensor. Still getting Boost pressure sensor signal interruption code Boost pressure sensor signal interruption oKurzschluss to earth Code: 003F01. That is my only code. It comes back after a couple of days after I clear it. It's an 09 X5 35d w/ 44k miles. I replaced the MAP sensor last month. It hesitates while accelerating gently. In addition to the sensor I have changed all vacuum hose, actuators, and the red boost hose. I pulled the manifold last week and there was not a ton of CBU. Any ideas what I should check next? Could Rheingold help? The sensor wires directly to the ECMs so I don't think there is a ground connection point to check. I suppose there is a chance the new sensor is also bad. That is a easy $70 check. I checked ground with my volt meter and it shows as good even when I wiggle the pigtail of wire around. Thanks Attached Images
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03-30-2016, 06:50 PM	#3
smass Lieutenant Colonel 430 Rep 1,607 Posts Drives: 2010 335i 8 speed Join Date: Sep 2010 Location: Scottsdale, AZ iTrader: (1) Garage List 2010 E90 335i [0.00] 2016 F15 35i [0.00] 2003 E53 3.0 [0.00] 2006 E90 325i [0.00]	Here is what the front EGR looks like. The E70 has a 2nd EGR by the turbos that I have not checked yet. Attached Images
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03-31-2016, 10:50 PM	#4
BB_cuda Brigadier General 796 Rep 3,572 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	Smassey, that looks like the older style of hi press EGR valve. Reason I recognize it is the inward protruding boss on the left. I had the recall done and the EGR isn't made like this anymore. I got another used EGR valve so that I could machine out its throat and this one looked same as yours prior to me hacking it into a smooth throat. I will double check. That said, X5 hi press valve could be different and similar in design to obsolete 335d valve. Did you have the recall work done?
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04-01-2016, 03:59 PM	#6
BB_cuda Brigadier General 796 Rep 3,572 Posts Drives: 2011 335D Msport, 2013 X5D Join Date: Nov 2011 Location: Clear Lake, Texas iTrader: (0)	I'm sorry. I messed up. Your valve is the updated one. I have a picture of my updated valve. It matches the #1 in your attached illustration. Indeed, your #2 was what I hacked up for my "straight through" valve. Second pic is a side by side of old "throat cleared" valve and updated one. And sorry again for pulling off track. My bad. I don't have picture of old valve before surgery began. Attached Images
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03-30-2016, 04:00 PM	#2
Hoooper Colonel 213 Rep 2,210 Posts Drives: 335D Join Date: Jun 2013 Location: Petaluma, CA iTrader: (0)	All the information on this code suggests its either the MAP sensor which you already replaced, or EGR failure (CBU??). Thats all based on older models though.
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