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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > P29F3 fuel pressure sensor shadow code help



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      02-10-2013, 04:07 PM   #23
BMWM.D.
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Quote:
Originally Posted by maximum96 View Post
Ive had the lpfs error for about a yyear and not able to clear, logging on the jb4 shows it pinned to the max value, never had a problem, just not able to log the lpfp. My question is, will the lpfp alwats be running at max potential, in theory decreasing the lpfp life? Never had a problem starting and always takes up to 40% e85 with 93 good....
I'm not totally sure on that. I'm just the type that likes my engine to operate as it was designed when possible. The sensor is there for a reason. For less than $100 and maybe 30 minutes of your time, it's worth doing.
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      02-10-2013, 06:17 PM   #24
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Of course, just putting out there that this is a very common problem and many run with this ghist code with no problems, but i have been convinced to replace mine also, i just placed my order, lets keep this thread alive so we can give our impressions after installing a new sensor...
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      02-11-2013, 01:14 AM   #25
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Good idea! I'll post my impressions with the new sensor compared to the old when I get a chance to put it on.
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      02-11-2013, 01:40 AM   #26
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I replaced my low pressure fuel sensor about a month ago as I had the 29F3 code for more than a year. After replacing it, the only thing I noticed was that my low pressure fuel pump wasn't running at max all the time based from my logs. Drivability was near the same as before and I couldn't tell a difference in terms of performance gain or loss, but hey at least the code was gone lol.
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      02-11-2013, 10:36 PM   #27
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That's good to know. So it doesnt seem the bad sensor was causing a loss of power or anything?
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      02-11-2013, 10:55 PM   #28
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Quote:
Originally Posted by Spoolin1 View Post
That's good to know. So it doesnt seem the bad sensor was causing a loss of power or anything?
In my case, it didn't cause a loss of power but I know I read other peoples experience that they did lose power and/or experienced persistent misfires. Keep us updated when you switch yours out.
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      02-12-2013, 09:13 PM   #29
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Will do. I know I haven't noticed any misfires yet, and I still have the original plugs in the car with 29k miles.
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      02-15-2013, 01:39 AM   #30
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Replaced mine earlier today, cleared code an code gone...i can finally log lfpp...do not feel any difference though , did not log yet ....remove dci, charge pipe and throttle body, then slip off wire harness bundle ( pita) to gain enough access to sensor.
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      03-24-2013, 11:37 PM   #31
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I'm so glad this is on here. About 7 months ago I went WOT and got a CEL. And never knew what it was. I cut the car of and cut it back on and the CEL was gone. And ever since every time I went WOT I would get a studder and then a CEL. So I thought it was the coil. So saturday I was at my friend's shop and he check it with hi AUTEL, and I got this code. Where is the sensor located...b/c if its something I can do myself I'll do it. I miss driving WOT on my car
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      03-25-2013, 12:04 AM   #32
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Quote:
Originally Posted by cn555ic View Post
The sensor cost about 100 bucks or so and it's not hard to change if you have some knowledge of the N54 engine and how to get stuff off. Might worth to do it yourself like I and many have done before
Totally agree....15 min install.
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      03-25-2013, 05:49 PM   #33
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anyone have a DIY on this yet. I couldn't find one.
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      03-25-2013, 08:12 PM   #34
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Quote:
Originally Posted by ACEE
anyone have a DIY on this yet. I couldn't find one.
I was wondering about the location of this sensor too. I didn't see a DIY either. Ive been seeing more people post about this. Anyone with a camera? Just need the basic location and tools needed.
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      03-26-2013, 11:06 AM   #35
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Quote:
Originally Posted by RnmEvo9 View Post
In my case, it didn't cause a loss of power but I know I read other peoples experience that they did lose power and/or experienced persistent misfires. Keep us updated when you switch yours out.
I am receiving CES light when going wot at the top of 4th. This was the code that appeared. I'm curious as to how to test whether the sensor is defective or not. Sure its $100 only but I'd rather pocket the $100 unless I can definitively pinpoint the sensor as the cause. Can logs help pinpoint this issue or no?
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      03-26-2013, 11:10 AM   #36
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http://www.e90post.com/forums/showthread.php?t=763958
Here is a bit of a DIY, or at least the location of the lpfp sensor
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      04-23-2013, 02:18 PM   #37
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Finally got around to changing the LP fuel sensor in my 67k 2008 335i and I figured my experience might help someone else out. Initially after running e85 for 1 month I was consistently getting CEL's and limp modes between 2-3k even after returning to normal gas, so tune was removed for a while. After getting a DP, tune was re-installed and set to monitor boost and AFR on the dash. I noticed very lean AFR's in 2nd or 3rd gear at quarter throttle between 2-3k rpm on Stage 1 and 2 Procede tune. Engine would bog and could be pushed to misfire unless throttle was decreased and presumably LP pump was allowed to catch up. No problems with tune removed on map 0. 10739 code was present ever since tune was installed around 40k. I decided to combine a DIY walnut blasting with LP sensor swap out. After sensor swap code disappeared, the car is running perfectly now.

Here are some pics. Most of what I saw online was so zoomed in it was difficult for me ascertain where the LP sensor was since I had never taken manifold off or even the engine cover off before.

Engine cover off and cables stored in "cable management" hump



Charge pipe removed and throttle body unscrewed from manifold cover reveals the "evil box"




Despite all the DIY's on intake cleaning I was still unclear why this box was so evil until now.




40 minutes later the box is finally of the rails that hold it in place




Manifold off...




Here's the low pressure fuel sensor





Here is it's location zoomed out. Notice it's right next to the HPFP. I can't believe they didn't just change it when they changed the HPFP under the recall.



Hopefully this helps some one else out who is attempting to change it themselves.

Last edited by INR96; 04-24-2013 at 09:02 AM.
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      04-23-2013, 03:22 PM   #38
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Thanks! I'll be doing mine in the next few weeks. Any notices in fuel mileage before and after? I can't figure out if this is contributing to my poor mpg or its something else. I don't rip it around town and I get like ~ 15 mpg. :/
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      04-23-2013, 03:53 PM   #39
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It's still early, since I've only had one highway trip since I swapped it out 4 days ago. Before I was between 18 and 19 mpg with highway driving. Now it's up to 20 mpg. It makes me wonder if the sensor was bad early on since the car has never averaged much better than 19.

After a couple weeks and changing to non-RFT Michelin Pilot Super Sports it hovers between 22 and 23 mpg.

Last edited by INR96; 05-15-2013 at 09:41 AM.
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      05-31-2013, 11:21 PM   #40
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I finally got my new sensor in and covered under CPO. The car was pretty steady at around 20.8 mpg all around driving and now it's staying around 22.4 so far (this is reading mpg with the dash computer, so not sure how accurate it is but its numbers for both with old and new sensors), so the new sensor may have helped out a bit. It's still too early to tell for sure since it's only been a week or so, but it looks like it may be better.
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