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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 code - fuel pressure sensor fault



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      12-09-2012, 12:40 PM   #45
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Quote:
Originally Posted by Fitz335 View Post
So pulled the codes this morning, the LPFS code is still there for some reason even though I replaced the damn sensor already. Any ideas?

The misfire was on cylinder 1 again, so thinking bad plug/coil.
Did you clear the codes after the LP sensor was changed out?
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      12-10-2012, 10:29 AM   #46
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Apparently the intake valves get so bad they create misfires. There's a local company I found that still does the walnut blast. Hopefully I can get mine done soon.
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      12-10-2012, 09:43 PM   #47
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I am having same issues, real strange, thanks for the info
hope it helps

Quote:
Originally Posted by BoostedE90 View Post
When I got 29F3 code it turned out to be a bad fuel temperature/pressure sensor causing low fuel pressure. However, mine was coupled with 2AAF and 29F2 codes.

Part number is 13537614317
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      12-10-2012, 09:45 PM   #48
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ths is such a great diy
I didn't need the special screwdriver, but otherwise great info.
Quote:
Originally Posted by Ilma View Post
I found a DIY here: http://forums.5series.net/diy-do-you...or-n54-124086/ and he has really good advice on how to deal with that wiring box.

Rigged a special tool using a screwdriver.
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      12-10-2012, 09:48 PM   #49
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now I have to go change part 13537614317 per boosted recommendaton
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      12-10-2012, 10:26 PM   #50
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Quote:
Originally Posted by neilvosko View Post
now I have to go change part 13537614317 per boosted recommendaton
? Thats the part number for the low pressure fuel sensor! YOu didnt get that part number when you changed yours out?
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      12-10-2012, 11:36 PM   #51
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sorry, dont know what the *##$ i was talking about.

i replaced it with the newest number, like the 7 series one.
the shadow code is still there. i may brake out the INPA to clear it.
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      12-11-2012, 02:02 PM   #52
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you dont have a cobb or jb4?
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      12-12-2012, 08:26 PM   #53
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Quote:
Originally Posted by cn555ic View Post
Did you clear the codes after the LP sensor was changed out?
Ya I cleared the codes, the low pressure fuel sensor code comes back. No SES light but the code is there still.
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      12-12-2012, 09:21 PM   #54
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Quote:
Originally Posted by Fitz335 View Post
Ya I cleared the codes, the low pressure fuel sensor code comes back. No SES light but the code is there still.
You really need to get INPA working and check the value of the low pressure sensor to see what the readout is in Hpa...This will rule out if the sensor is defective or not..

Refer to this thread

http://www.e90post.com/forums/showth...=724147&page=3
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      12-13-2012, 01:38 AM   #55
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this happened to my car when I took it in for service. $80 for parts, $400 for labor. I wonder if this is the reason I get terrible gas mileage.
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      12-13-2012, 02:05 AM   #56
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Weird....my dealer is telling me , i also researched, anything emissions related is warrantied for 8 yrs 80000 miles, dealership assured me i will not pay any out of pocket. I have the same code, car runs and starts fine, but fuel mileage sucks, this also flatlines my lfp logs, so i cannot log my lpfp. This error may keep lpfp operating at maximum, thus maybe affecting fuel mileage, but am scared.to dealer my car because i know my car will start all sorts of problems.after dealer gets ahold of my car lol...btw i have 08 e60, 30000 miles and 29f3 was there before my jb4 and before using e85...
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      12-13-2012, 09:21 AM   #57
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Quote:
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this happened to my car when I took it in for service. $80 for parts, $400 for labor. I wonder if this is the reason I get terrible gas mileage.
Holy shit $400? Glad I did this one on my own.
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      12-13-2012, 10:52 AM   #58
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Holy shit $400? Glad I did this one on my own.
I got the stealership to price match the indy shop for $340.
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      12-16-2012, 05:57 PM   #59
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Quote:
Originally Posted by cn555ic View Post
You really need to get INPA working and check the value of the low pressure sensor to see what the readout is in Hpa...This will rule out if the sensor is defective or not..

Refer to this thread

http://www.e90post.com/forums/showth...=724147&page=3
So I got INPA working, one problem tho....

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      12-16-2012, 06:30 PM   #60
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WTF!!! Where is the LP sensor reading!! It would lead me to believe the wire is not installed back into the sensor or something is FUBAR!
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Last edited by cn555ic; 12-16-2012 at 06:36 PM.
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      12-17-2012, 12:22 PM   #61
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Guess I'm going to have to check the connector on it, sucks cause it's a PITA to get to.
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      12-21-2012, 05:33 PM   #62
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So I took it to these local guys that run a small bmw shop. They walnut blasted it for me, and changed the plugs. They said the plugs looked fine. They took before and after pictures of the intake valves and port, wow what a difference. The walnut blast and spark plugs got rid of the misfire, the car runs fan freaking tastic now.

so the sequence of events I experienced was:
1. p29f3 LPFP sensor failure, along with misfire, replaced LPFP sensor, still misfiring - it was the same cylinder creating the check engine light when misfiring. I had no long cranks, but i began getting idle misfires. The longer it got cold outside the worse my car ran.

2. walnut blasted and plugs changed. Car runs like a top. plugs didn't look too bad, intake valves and ports were caked pretty bad - car is at 37000 miles at this point.
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      05-08-2013, 09:44 AM   #63
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Wanted to say thanks for the info in this thread. I had the usual fuel pump code along with the low pressure sensor code 29F3 and am out of warranty. Cleared codes with INPA and 29F3 came right back. I tried to get INPA working to measure that sensor but no luck at all, going to keep working on that. I thought I would share some feedback on the replacement. In my opinion removing the cowl makes things easier and only takes a few additional minutes. I didn't remove it until I was putting things back together and made it easier to access that rear intake inlet but I was also installing a DCI. You don't need any special tools for the black box, just pull up and towards you from the drivers side. If necessary you can pry a small flat head into the clips to get it out but mine was no trouble. Also I left the wires on the sensor and just unclipped it from the black box, it was too hard to get to otherwise and didn't want to risk breaking it. Before putting things back together, it's a good time to clean the throttle body and oily chargepipe.

Code has not come back since, thanks again.
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      05-13-2013, 08:00 AM   #64
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Quote:
Originally Posted by neilvosko View Post
yea, take the intake and throttle body off, move the wiring harness and you are set. took me 30 minutes; the DCI and aftermarket charge pipe makes its easier.

the real question i have is how many people are having this issue, and better yet, how many people are having this issue shortly after using E85. I am now thinking E85 accelerated the aging of the sensor.
used e85 for about a week and bammmm there went the codes before that on 93 octane never had an issue.
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      06-06-2013, 11:57 PM   #65
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Just changed my sensor. Got rid of the p29f3 code but now i have the 2AAF code? Wtf....

Any thoughts? Did I mess install or was the p29f3 masking the 2AAF?
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      06-07-2013, 08:33 AM   #66
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Just got my sensor replaced recently. Is it safe to go back to using e85?
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