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Turn it off, come back in 10 minutes it starts then it shuts off?

Tiny
BHAMDOC1973
  • MEMBER
  • 2011 BMW 535I
  • 6 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 92,000 MILES
Car starts fine with no misfiring or stumbling, leave it running and is fine. Turn it off, come back in 10 minutes it starts then shuts off. I pulled the codes first and there were few fuel related ones first, then deleted them and when I started it and she stumbled pulled only one code which is p15df. I'm trying to find out if this one has a low-pressure sensor or not, as some of them do not. And whether this pinpoints to a low pressure sensor under the hood or a low-pressure pump in the tank, getting some conflicting views based on my readings.
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Sunday, August 20th, 2023 AT 1:13 PM

12 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,522 POSTS
It sounds like the engine coolant sensor #2 needs to be replaced, here is information on the code and the sensor location so you can change it out.

The P15DF code in a 2011 BMW 535i indicates a fault related to the "Engine Coolant Temperature Sensor 2."

Check out the images (below). Please let us know what you find.
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Monday, August 21st, 2023 AT 10:21 AM
Tiny
BHAMDOC1973
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That is weird, everywhere I looked it talks about a fuel sensor or a pump, ugh.
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Monday, August 21st, 2023 AT 10:23 AM
Tiny
BHAMDOC1973
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I have the N54 engine.
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Monday, August 21st, 2023 AT 12:52 PM
Tiny
BHAMDOC1973
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Unless that end number of 54 is just for the evap.
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Monday, August 21st, 2023 AT 3:28 PM
Tiny
KEN L
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My bad, the code is for Faulty Rail-Pressure Sensor, here is the location so you can swap it out to fix the problem. Check out the images (below). Please let us know what happens.
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Tuesday, August 22nd, 2023 AT 10:47 AM
Tiny
BHAMDOC1973
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Do you have a part number?
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Tuesday, August 22nd, 2023 AT 10:58 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,554 POSTS
Changed the rail sensor and the tank pump same thing. First picture is when the car is off ignition on. Second when started.
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Wednesday, August 30th, 2023 AT 7:57 AM
Tiny
BHAMDOC1973
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  • 1,554 POSTS
Codes
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Wednesday, August 30th, 2023 AT 7:58 AM
Tiny
BHAMDOC1973
  • MEMBER
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I see tthe fuel line goes under the intake, is there another sensor there? Also the hpfp is not on too like the 4 cylinders, can you tell me if its under the intake?
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Wednesday, August 30th, 2023 AT 8:06 AM
Tiny
KEN L
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From the codes it looks like the fuel pump is going out. Have you done a fuel pressure test?

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

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Thursday, August 31st, 2023 AT 10:18 AM
Tiny
BHAMDOC1973
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Disconnected the hose to measure pressure but noticed nothing came out. Removed pump again turned out one of the wires inside is loose, connected it and all good, thanks.
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Thursday, August 31st, 2023 AT 11:40 AM
Tiny
KEN L
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Glad you could get it fixed, thanks for letting us know. Please use 2CarPros anytime we are here to help.
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Friday, September 1st, 2023 AT 8:56 AM

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