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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
  • 42,949 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." This sensor is responsible for measuring the temperature of the engine coolant. The Engine Control Module (ECM) uses this data to manage engine performance, fuel efficiency, and emissions.

The code description typically reads as "Engine Coolant Temperature Sensor 2 Signal Plausibility." This means that the signal from the coolant temperature sensor is not aligning with the expected or plausible range based on other sensor inputs. This discrepancy can trigger the check engine light and potentially affect the engine's performance and efficiency.

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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  • 1,291 POSTS
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
  • 1,291 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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Codes
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Wednesday, August 30th, 2023 AT 7:58 AM
Tiny
BHAMDOC1973
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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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