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HKD126 HKD126 is offline
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Default 29F3 code after removing ** fix - 09-10-2019, 09:43 AM

I just purchased a 2009 335xi that was nicely modded. After the first day of ownership I started getting 02 codes and discovered that the JB4 had a ** fix installed on it. After removing the D P fix and installing the new harness wires today, I started to get a 29F3 code - Faulty Low Fuel Pressure Sensor.

Is the car fine to drive with this code and in this state?

My current fuel pump is also a bit weak and will be replacing with a new Fuel It Stage 2 bucketless pump. Could the D P fix have been masking this new code? Do I just need a new LPFP or both a sensor and a pump? If I get a new sensor is there any reason to get the new sensor with the updated fuel line or will just a replacement old style sensor be fine? Either one I get will be replaced with genuine BMW parts.

Thanks.

Last edited by HKD126; 09-10-2019 at 09:52 AM..
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Dave @ BMS/Fuel-It!'s Avatar
Dave @ BMS/Fuel-It! Dave @ BMS/Fuel-It! is offline
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Default 09-11-2019, 10:30 AM

We'd need to see logs.

But the fix has 0 correlation w. the lpfp sensor



http://www.fuel-it.biz/

e92 AT 335xi 2.0
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HKD126 HKD126 is offline
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Default 09-11-2019, 11:07 AM

Here are some map 2 logs. Codes are all gone now... Not sure what that was all about.
Attached Files
File Type: csv 2019-09-10 16_20_39_Map-2.csv (22.8 KB, 9 views)
File Type: csv 2019-09-10 16_46_48_Map-2.csv (23.5 KB, 8 views)
File Type: csv 2019-09-10 16_51_08_Map-2.csv (17.9 KB, 9 views)

Last edited by HKD126; 09-11-2019 at 02:30 PM..
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Default 09-12-2019, 01:04 PM

n54 life haha.

FF looks to be maxed out and boost looks to be very laggy- You might have a leak somewhere in the system



http://www.fuel-it.biz/

e92 AT 335xi 2.0
Doc Race Kit 6062
Fuel-It!Platinum DIY PI Kit + Stage 2BL
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HKD126 HKD126 is offline
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Default 09-12-2019, 01:42 PM

Quote:
Originally Posted by Dave @ BMS/Fuel-It!
n54 life haha.

FF looks to be maxed out and boost looks to be very laggy- You might have a leak somewhere in the system
Could it be old vanos solenoids as well? I cannot find a leak.

Last edited by HKD126; 09-12-2019 at 05:52 PM..
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Default 09-15-2019, 10:16 PM

Quote:
Originally Posted by HKD126
Could it be old vanos solenoids as well? I cannot find a leak.
Ehhh, maybe? Boost solenoids seem a little more likely.

Did you pressure test the system or just eye ball it?



http://www.fuel-it.biz/

e92 AT 335xi 2.0
Doc Race Kit 6062
Fuel-It!Platinum DIY PI Kit + Stage 2BL
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