low fuel pressure sensor

cn555ic · 11-29-2012, 09:10 AM

Quote:

Originally Posted by neilvosko

I just replaced my sensor but he fault came back
Wtf?

It's possible the new sensor you replaced is also faulty. The 29F3 code should be gone as soon as you replace that sensor. I had this code like forever and upon changing out the sensor and clearing all the codes, that error code has been permanently gone so far.

neilvosko · 11-30-2012, 09:48 PM

unlikely, but possible.
i read that some with o2 sensor issue had this problem as well.

neilvosko · 11-30-2012, 10:06 PM

Hi all,

i am having the 29F3 sensor fault code, replaced my sensor but now its back, sorry to bug you all, but do you recall how you had this problem resolved?

thanks in advance,
Neil

longliven54 · 12-02-2012, 04:18 PM

Quote:

Originally Posted by neilvosko

Hi all,

i am having the 29F3 sensor fault code, replaced my sensor but now its back, sorry to bug you all, but do you recall how you had this problem resolved?

thanks in advance,
Neil

i never replaced the lpfs,, but when i replaced both my o2 sensors , this code has not come back.

neilvosko · 12-02-2012, 09:56 PM

Nice.
Which o2 sensors since there are 4?

Quote:

Originally Posted by longliven54

i never replaced the lpfs,, but when i replaced both my o2 sensors , this code has not come back.

FitzMLife · 12-07-2012, 07:01 PM

Copied this from another thread

Quote:

Just replaced this part in my car today. I removed the charge pipe and then separated the intake from the block, I did not completely remove the intake manifold due to issues with removing the wiring harness attached to the underside of it. Got a large ratchet and a 24MM Deep sockt and was able to remove the part. Took me a about 60-90 minutes from start to finish(I was also bullshitting with other mechanics for a lot of this).

Sorry I don't have a camera, these are all phone pics

Get all the basic stuff out of the way, remove the charge pipe and engine cover, disconnect associated cables(two under engine cover), one on the throttle body, and another next to the intake manifold(yellow). Remove your DCI or air box(blue). Charge pipe requires a torque screw and a flat head, pretty easy(orange).

Remove the 1 bolt and 6 nuts from the intake and separate it from the block, this requires patience and a bit of jiggling.

Replace the Low Pressure Fuel Sensor.

ChuckD05 · 12-09-2012, 03:41 PM

Did this today, no need to take off the manifold. Just whatever intake system you have, charge pipe, throttle body, and the black wire box... That gives you plenty of access to the lp fuel sensor... I had to use a 1 inch wrench to get the old one off, others said different sizes but 1 inch worked for me.

The box is a pita to remove off of the tabs. It's plastic and the tabs are metal, I pryed the plastic part of the wire box tugged on it until it popped out. I cracked the side of 1 of the 4 plastic pieces that hold it in place on the metal tabs, but it's no big deal, can hardly notice and the box is still firmly in place and if I ever have to remove it again it will make my life easier, lol..

Job took about 45 minutes...

DetectiveLoki · 12-12-2012, 09:54 PM

my water pump stop working so I took it to dealership to replace. they told me my lpfs needs to be replace because it'll make my car sluggish. however, I havent seen any engine light come on due to lpfs. my car wasn't sluggish until today when my water pump went bad. should I replace it? I check indy shop and it's $300 vs $500 from dealership.

kcrake · 07-19-2015, 11:17 AM

Did this today also. As ChuckD says, didn't need to touch the intake manifold. Once the throttle body was removed, and the black connection box was loose. it was easy to get in there with a wrench and get the sensor out. All in all, an easier job than I expected. Hardest part was getting all the plastic connectors to come apart without breaking them.

335i SA Driver · 03-15-2018, 12:48 PM

I have a 2AAF fault code. What is the first things I have to check. The company who diagnosed it, immediately said it is my HPFP. After googling this it refers to Intank LPFP, not the HPFP.

Advise from you people will be highly appreciated

Airrik84 · 09-24-2018, 04:01 PM

Quote:

Originally Posted by 335i SA Driver

I have a 2AAF fault code. What is the first things I have to check. The company who diagnosed it, immediately said it is my HPFP. After googling this it refers to Intank LPFP, not the HPFP.

Advise from you people will be highly appreciated

Hi I got that code along with p29f2.... did you end up resolving the issue?

11-30-2012, 09:48 PM	#46
neilvosko Lieutenant Colonel 95 Rep 1,529 Posts Drives: 335i e92 FBO Join Date: Dec 2011 Location: miami iTrader: (19)	unlikely, but possible. i read that some with o2 sensor issue had this problem as well.
	Appreciate 0 Quote

11-30-2012, 10:06 PM	#47
neilvosko Lieutenant Colonel 95 Rep 1,529 Posts Drives: 335i e92 FBO Join Date: Dec 2011 Location: miami iTrader: (19)	Hi all, i am having the 29F3 sensor fault code, replaced my sensor but now its back, sorry to bug you all, but do you recall how you had this problem resolved? thanks in advance, Neil
	Appreciate 0 Quote

12-09-2012, 03:41 PM	#51
ChuckD05 NeedsMoarBoost 44 Rep 527 Posts Drives: 08 135i / 06 e90 325xi Join Date: Mar 2010 Location: NY iTrader: (0) Garage List 2009 BMW 335i Mtech [10.00] 2006 BMW 325xi e90 [10.00] 2008 BMW 135i M-Sport [7.80]	Did this today, no need to take off the manifold. Just whatever intake system you have, charge pipe, throttle body, and the black wire box... That gives you plenty of access to the lp fuel sensor... I had to use a 1 inch wrench to get the old one off, others said different sizes but 1 inch worked for me. The box is a pita to remove off of the tabs. It's plastic and the tabs are metal, I pryed the plastic part of the wire box tugged on it until it popped out. I cracked the side of 1 of the 4 plastic pieces that hold it in place on the metal tabs, but it's no big deal, can hardly notice and the box is still firmly in place and if I ever have to remove it again it will make my life easier, lol.. Job took about 45 minutes... __________________ 08 135i 6m - 12.1@120.2 2.0 60ft - JB4/Meth - SOLD 09 335i e92 Mtech - RB FBO
	Appreciate 1 Quote

12-12-2012, 09:54 PM	#52
DetectiveLoki First Lieutenant 19 Rep 317 Posts Drives: 2008 BMW 335i Convertible Join Date: Jan 2012 Location: Orange County - SOCAL iTrader: (4)	my water pump stop working so I took it to dealership to replace. they told me my lpfs needs to be replace because it'll make my car sluggish. however, I havent seen any engine light come on due to lpfs. my car wasn't sluggish until today when my water pump went bad. should I replace it? I check indy shop and it's $300 vs $500 from dealership.
	Appreciate 0 Quote

07-19-2015, 11:17 AM	#53
kcrake Registered 0 Rep 1 Posts Drives: '07 335i Sedan Join Date: Jul 2015 Location: Virginia, USA iTrader: (0)	Did this today also. As ChuckD says, didn't need to touch the intake manifold. Once the throttle body was removed, and the black connection box was loose. it was easy to get in there with a wrench and get the sensor out. All in all, an easier job than I expected. Hardest part was getting all the plastic connectors to come apart without breaking them.
	Appreciate 0 Quote

03-15-2018, 12:48 PM	#54
335i SA Driver Registered 0 Rep 1 Posts Drives: 2008 335i Join Date: Mar 2018 Location: Gaborone iTrader: (0)	Code 2AAF I have a 2AAF fault code. What is the first things I have to check. The company who diagnosed it, immediately said it is my HPFP. After googling this it refers to Intank LPFP, not the HPFP. Advise from you people will be highly appreciated
	Appreciate 0 Quote