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      12-16-2012, 07:21 AM   #1
Darkside400
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Error code 29F2 - Advice

Hi guys/girls, I've just bought an evolve r-cable to get my 2007 335i remaped...however I have the 29F2 error code.

"1) 29F2 fuel high pressure system, fuel pressure"

I have cleared the error, run the car for a week and its come back. It seems to occure when I have had a spirited drive home, and it occurs the next morning. Only happened twice but on startup it says "reduced power..". I re-start the car and its fine.

So, I believe I need to get the car sorted before the remap...(note, car has had the bmw firmware fix released a few years ago).

The bmw independant specialist advised me it could be the HFP sensor which would cost 100 to fix plus an Autologic code read (extra 50!).

Do I need that extra code read? they say it gives them more detail to diagnose.

Also, if its not a sensor...and turns out to be the pump, is it worth getting a warrenty to cover it? (costs alot to fix?)

Advice really welcome here.
Thanks
Matt
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      12-16-2012, 08:28 AM   #2
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Remove everything and dealer it.

Hpfp is around £500 inc fitting. Don't waste money if you have a warranty..
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      12-16-2012, 09:51 AM   #3
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Quote:
Originally Posted by Darkside400 View Post
Hi guys/girls, I've just bought an evolve r-cable to get my 2007 335i remaped...however I have the 29F2 error code.

"1) 29F2 fuel high pressure system, fuel pressure"

I have cleared the error, run the car for a week and its come back. It seems to occure when I have had a spirited drive home, and it occurs the next morning. Only happened twice but on startup it says "reduced power..". I re-start the car and its fine.

So, I believe I need to get the car sorted before the remap...(note, car has had the bmw firmware fix released a few years ago).

The bmw independant specialist advised me it could be the HFP sensor which would cost 100 to fix plus an Autologic code read (extra 50!).

Do I need that extra code read? they say it gives them more detail to diagnose.

Also, if its not a sensor...and turns out to be the pump, is it worth getting a warrenty to cover it? (costs alot to fix?)

Advice really welcome here.
Thanks
Matt
29F2 could be map related if the tuner goes a bit overboard with the fueling and asks too much of the system. However I got no experience with Evolve's maps, but I don't think they are supposed to be that aggressive. I had a few 29F2's codes in the past when Shiv decided to push the envelope with the aggressive maps. It's quite odd that it only happens the morning after a spirited drive and it makes me wonder what software version your car is on? Do you hear the fuel pump kick in when you unlock the car? You should hear a small whine for 1-2 seconds. BMW added this to later software updates to prime the low pressure fuel system to avoid starving the HPFP when starting from cold. If you don't hear this when it's possible that your car may need to be updated. This would probably be BMW's first fix if you brought it in to them.


The code for a faulty low pressure sensor will normally be 29F3, but it's possibly that a sensor not performing 100% would cause the low pressure fuel pump not to deliver enough fuel to the HPFP. AFAIK, the sensor is fairly cheap, but it's a pain to get to. I just wouldn't expect this to only be the case when it's cold. If the sensor was going I would expect this also to happen when at WOT.

Anyway, the low pressure sensor #7 in the link below:
http://www.realoem.com/bmw/showparts...83&hg=13&fg=15

Replacing it is a different story. You need to remove the airbox, throttle body & intake as the sensor is hidden under the intake.
The fuzzy pictures from this post may give you an idea:
http://www.e90post.com/forums/showpo...8&postcount=50

I all honesty 100+50 to replace the sensor doesn't sound all that bad if parts (sensor + intake gaskets) are included in that price. It's probably an hour's work to replace with diagnosing and replacing the part. BMW will charge that just to look at it.

Only issue with reverting to stock and dealering it, is that it may not trigger the code under these conditions. So you can either wait until it gets so bad that it fails under stock conditions or try a couple of things to fix it before going down this route.

1. Replace Low pressure sensor (~150)
2. Update software on car (if on older revision that doesn't prime the pump) ~(200)
3. Replace HPFP (~500)
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      12-16-2012, 12:20 PM   #4
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When i had that code+ long crank start up+ car dies on morning start up bmw replaced injectors with new parts then problem all gone since
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      12-16-2012, 01:01 PM   #5
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thanks guys, just for clarity, the car is standard now...i have not put the map on the car.
I dont have a warranty.

how much could injectors set me back? would that be covered under a warranty?
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      12-16-2012, 02:00 PM   #6
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Maybe some of the 335i guys can advise but didn't BMW offer extended warranty cover on the hpfp issues as its a known issue

Don't want to get your hopes up, just thought I heard this
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      12-16-2012, 02:14 PM   #7
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Quote:
Originally Posted by Darkside400 View Post
thanks guys, just for clarity, the car is standard now...i have not put the map on the car.
I dont have a warranty.

how much could injectors set me back? would that be covered under a warranty?
Parts are ~100/cylinder + fitting + coding, so you are looking at a good 700-800. Definitely not the first thing you should try.

Quote:
Originally Posted by briers View Post
Maybe some of the 335i guys can advise but didn't BMW offer extended warranty cover on the hpfp issues as its a known issue

Don't want to get your hopes up, just thought I heard this
Only in the US due to the class action suit. AFAIK no other country are so lucky.
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      12-16-2012, 04:14 PM   #8
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      12-17-2012, 08:39 AM   #9
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Quote:
Originally Posted by Darkside400 View Post

The bmw independant specialist advised me it could be the HFP sensor which........ 50 for extra codes to be read.....
AFAIK there isn't a HPF sensor, only a LPF sensor. The HPF sensing is built into the HPFP unit.

see here http://www.realoem.com/bmw/showparts...83&hg=13&fg=15 LPF sensor is item 7, HPFP complete is item 1.

Does the engine suffer from the long cranking time on cold starts? or when warm after a spirited drive? Like a second or more of cranking before fire up? If so it's 99% sure to be HPFP on its way out. Very common unfortunately, in fact is there a single 335i on here that HASN'T had a new HPFP (some more than 1).

Also, how did you read the codes? do you have a BT leads, or does the evolve lead let you do this? Does it give full BMW code readouts or a restricted selection?
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Last edited by doughboy; 12-17-2012 at 08:50 AM.
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      12-17-2012, 05:09 PM   #10
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So either way, I have to get it fixed at my own cost...damn.

Forgive my nievity...what is a "long cranking time on cold starts" ?

I used the Evolve cable - it says exactly as follows:

// BMW Trouble Code list
//
// ECU Type : Siemens DME MSD80
// Vehicle Manufacturer Ecu Hardware Number : 7611397
// Vehicle Manufacturer Ecu Software Number : 7583351
// Hardware Reference Number : 0044DC0I8A0SWTD1S
// Ecu Manufacturing Date : 18.09.2007
//
// 1) 29F2 fuel high pressure system, fuel pressure
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      12-17-2012, 05:42 PM   #11
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There are few videos on youtube showing you long cranking time....search for n54 hpfp failure/ cranking time...
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      12-18-2012, 06:10 AM   #12
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Quote:
Originally Posted by Darkside400 View Post
Forgive my nievity...what is a "long cranking time on cold starts" ?
It takes a bit longer to start! (engine cranking, but not firing for half to 1 second or so)

+1 google / youtube it, it's the main giveaway to a failing HPFP, as discovered by the many tens of thousands that have failed....
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      12-18-2012, 07:29 AM   #13
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As 335rocks says it could be the map.

I'd be contacting Evolve for advice before replacing hardware...
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      12-18-2012, 09:06 AM   #14
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Phil, I thought the OP hadn't put the MAP on the car yet? Only connected the evolve cable and read the fault code?
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      12-18-2012, 09:20 AM   #15
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Ah I mis-read it..

Probably HPFP needs to be replaced. Depending upon the mileage, I'd get the Intake Valves cleaned at the same time!!
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      12-18-2012, 01:22 PM   #16
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Quote:
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Ah I mis-read it..
Ah me too. In that case most likely the pump. However it doesn't help the OP as he is still out of warranty.

OP does your current software prime the fuel pump and do you hear a whine when you unlock the car?

As Phil200tdi mentioned, this is a good time to get the intake valves cleaned. Definitely worth considering.
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      12-18-2012, 01:23 PM   #17
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