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      07-28-2009, 12:24 AM   #1
AwBoostedCR
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Unhappy low fuel pressure sensor

my low fuel pressure sensor is bad and needs to be replaced and i get engine malfunctions!! is this a sign of HPFP failure??
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      07-28-2009, 11:21 AM   #2
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Originally Posted by AwBoostedCR View Post
my low fuel pressure sensor is bad and needs to be replaced and i get engine malfunctions!! is this a sign of HPFP failure??
I just had this exact same problem last week. The tech said it was unrelated to HPFP issues. My car has 57k mi. and the sensor was replaced under warranty (I bought the extended plan).
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      07-28-2009, 11:51 AM   #3
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what was the code that the dealer found for the sensor being bad??
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      07-28-2009, 11:53 AM   #4
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Quote:
Originally Posted by AwBoostedCR View Post
my low fuel pressure sensor is bad and needs to be replaced and i get engine malfunctions!! is this a sign of HPFP failure??
what code did you get?
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      07-28-2009, 01:11 PM   #5
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i belive the code was 29f3, but im not 100% sure. as soon as the code is cleared it comes back right away, it doesnt delete.
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      07-28-2009, 01:13 PM   #6
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Dealer won't replace low pressure pumps due to those codes. BMW specifically tells them not to replace.
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      07-28-2009, 01:23 PM   #7
AwBoostedCR
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so what do i do?
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      07-28-2009, 01:43 PM   #8
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Quote:
Originally Posted by AwBoostedCR View Post
i belive the code was 29f3, but im not 100% sure. as soon as the code is cleared it comes back right away, it doesnt delete.
I have that same code that doesn't delete! There is nothing wrong with the car though...As for the sensors there are two of them...one for the high side and low side...the code 29f3 simply states fuel pressure sensor electrical....but it doesn't say which one....I checked the location of both sensors and the high pressure seems very easy and accessible to change out, but the low one has no clearance from the engine bay due to the intake manifold. I already purchased the high pressure one and will change it out soon when i get a chance, but the low one seems to be very difficult for me to access ...My question is how did they know automatically it is the low pressure one instead of the high pressure sensor when the code only tells of a sensor problem??
Can you get the exact part number that was changed so i can diagnose my problem....thanks alot if you can do this for me
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      07-28-2009, 01:55 PM   #9
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Quote:
Originally Posted by Bubbles View Post
Dealer won't replace low pressure pumps due to those codes. BMW specifically tells them not to replace.
Why would they not replace something that is broken or malfunctioning? I don't understand, if the sensor is faulty they changed it for the OP, but if what your saying and i am understanding right, they won't fix it?? That just doesn't make sense...can you elaborate where you heard this from?
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      07-28-2009, 04:44 PM   #10
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i took my car to a local dealership when i was having the problem and a tech read codes on my car and told me it was the low pressure sensor but he couldnt work on my car because it was too modified. so thats why they didnt fix it. as far as him knowing which sensor it is ihave no idea.
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      07-28-2009, 08:24 PM   #11
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Quote:
Originally Posted by AwBoostedCR View Post
i took my car to a local dealership when i was having the problem and a tech read codes on my car and told me it was the low pressure sensor but he couldnt work on my car because it was too modified. so thats why they didnt fix it. as far as him knowing which sensor it is ihave no idea.
I hear you man, but I don't know about you guys but if anyone is scanning my car and reading codes, you bet I will be asking every possible question that i could think of! I guess I like to be well versed and understand the car! Anyone else have this problem and know the part that was changed?
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      07-28-2009, 08:55 PM   #12
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As for changing out the high pressure sensor, it looks really easy, just need to take off the engine cover and its towards the back on the fuel rails....The hard one is the low pressure sensor which is under the intake manifold, which I can't see BMW making it so hard that you would need to remove the intake manifold to get to that sensor! It seems impossible to get to the sensor from the top of the motor without removing the manifold but I am thinking maybe it can be access from underneath the car.. I will try to take a look at the bottom when I have a lift to take off the cover from underneath the motor....These sensors are basically screwed into place and the end is connected to a wire harnass...Changing a faulty sensor is a piece of cake, well at least the high pressure one!!
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      07-29-2009, 12:37 AM   #13
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yea too bad its the low pressure sensor lol
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      11-05-2009, 12:23 PM   #14
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Has there been any headway as to the cause of the 29F3 code that keeps coming back after you clear it.

I am getting the same code that you talk about cn555ic, the 29F3 code keeps coming back, but my car runs fines as you have stated.
Is there a reason why this code does not flag on the Idrive, I did not even know it was there until I started using my scan tool recently. I have had dealer visits and they have not said anything about it.
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      11-20-2009, 11:10 AM   #15
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Took my car in with 29F3 code, dealer said my HPFP was fine after performing the fuel pressure tests multiple times trying to get it to fail.

They did replace the sensor, here are the notes from the work order:

"check low pressure fuel system with mid had to hook up gt 1 and run test plan. found sensor reading 6.5 bar through dme and with mid reading 5.84 bar. replaced low pressure fuel sensor and retested sensor now both reading the same cleared faults car runs fine now"

no SES lights since, will run BT scan later today
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      11-20-2009, 12:48 PM   #16
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Quote:
Originally Posted by Daya View Post
Took my car in with 29F3 code, dealer said my HPFP was fine after performing the fuel pressure tests multiple times trying to get it to fail.

They did replace the sensor, here are the notes from the work order:

"check low pressure fuel system with mid had to hook up gt 1 and run test plan. found sensor reading 6.5 bar through dme and with mid reading 5.84 bar. replaced low pressure fuel sensor and retested sensor now both reading the same cleared faults car runs fine now"

no SES lights since, will run BT scan later today
I knew it was just a defective sensor thats not reading right and defective....I have this code also and my car is performing better than ever..
I already have the sensor, but too lazy to take off my CAI to get to it....Looks like a easy swap, but I am not worried because I know its a defective faulty sensor based upon DAYA's post
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      02-18-2010, 05:15 PM   #17
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I just scanned my car today, and I got the fuel pressure sensor code. I just had my hpfp replaced about a week ago..no check engine light, and car is running fine..any ideas?
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      02-18-2010, 05:24 PM   #18
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I just scanned my car today, and I got the fuel pressure sensor code. I just had my hpfp replaced about a week ago..no check engine light, and car is running fine..any ideas?
It's possible that the dealer automatically thought it was the hpfp when you described the problem to them. Either that or both were bad. I had my lpfp sensor replaced under warranty 2 weeks ago and I thought it was the hpfp
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      02-18-2010, 05:31 PM   #19
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well before i had the fuel pump replaced I had all the common problems of a bad fuel pump(long crank, etc.). Now the car starts up just fine and feels stronger with the new fuel pump..im just worried about the fuel pressure sensor, but after reading up on it, it seems to be a common problem that doesnt affect performance.

Not sure if I should take it to the dealer because I dont have a check engine light on. I guess Ill give me SA a call and see what he has to say, but I know how the dealer is when the check engine light isnt on..too them, no check engine light=no problems

Last edited by fast4door; 02-18-2010 at 05:56 PM.
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      03-16-2010, 10:50 AM   #20
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I have the SES light, and found out it was because of the low fuel pressure sensor. Does anyone know where to get this part or how much it goes for?

Also, is it dangerous to drive the vehicle with a bad sensor?
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      03-16-2010, 11:01 AM   #21
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I have the SES light, and found out it was because of the low fuel pressure sensor. Does anyone know where to get this part or how much it goes for?

Also, is it dangerous to drive the vehicle with a bad sensor?
#7 on here
http://www.realoem.com/bmw/showparts...83&hg=13&fg=15

i got mine through Tischer....
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      03-16-2010, 11:12 AM   #22
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#7 on here
http://www.realoem.com/bmw/showparts...83&hg=13&fg=15

i got mine through Tischer....
got it, thanks! so is it unsafe to drive under these conditions as of now until I get the sensor?
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