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Several codes and limp mode?

Tiny
BHAMDOC1973
  • MEMBER
  • 2014 BMW X3
  • 4 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 164,000 MILES
Bought it as is. Throttle has zero response on revving motor. Starts but had many codes. Deleted them and even before starting the cars the 2nd picture on engine module shows the codes. There are abs codes as well but those are maybe for the ABS sensors which is common and I can take care off. Sometimes runs and stalls.
2014 x3 x28i
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Thursday, September 14th, 2023 AT 12:15 PM

11 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

I looked at the codes you have. I suspect the oil pressure (too high before starting) is causing the limp mode issue. The pressure can't be too high with the engine off, so suspect there is a short in the wiring to the pressure/temperature sensor or the sensor itself has shorted internally.

I attached the directions below for replacing the sensor. Before you replace it, confirm the wiring is in good condition. Also, with the key on, confirm there is a 5v power supply to it.

Let me know what you find.

Joe

See pics below.
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Thursday, September 14th, 2023 AT 7:57 PM
Tiny
BHAMDOC1973
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  • 1,656 POSTS
Where is it under the intake?
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Friday, September 15th, 2023 AT 6:07 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

According to the directions, it is under the throttle body. They never like to make things easy.

If you look below, I attached the directions for removing the throttle body.

Let me know if this helps.

Take care,

Joe

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Friday, September 15th, 2023 AT 7:55 PM
Tiny
BHAMDOC1973
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  • 1,656 POSTS
I removed the throttle body and I can see one sensor attached to the block which has 3 wires to it. Is that possibly it? I unplugged it so you can see it. If so, which wire should have a 5v with ignition on and what is the part number, please?
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Sunday, September 24th, 2023 AT 7:08 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

It should be a brown wire. The other two will be black and one yellow with a blue tracer. See pic below.

As far as a part number, my manual isn't providing that information.

Take care,

Joe
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Sunday, September 24th, 2023 AT 1:16 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,656 POSTS
Yes, there is a 5v on one with ignition on.
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Sunday, September 24th, 2023 AT 1:17 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

If you have the power supply, the black wire should provide a ground path. Check to see if there is continuity to ground via that wire.

If you do, suspect the sensor is faulty.

Let me know.

Joe
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Sunday, September 24th, 2023 AT 1:48 PM
Tiny
BHAMDOC1973
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  • 1,656 POSTS
Yes has ground.
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Sunday, September 24th, 2023 AT 3:03 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi,

If we have power and ground, chances are the sensor itself is faulty and isn't sending a correct signal.

If you have gotten this far, I would replace it before reinstalling the throttle body. Hopefully that is the issue.

Let me know.

Joe
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Sunday, September 24th, 2023 AT 8:07 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,656 POSTS
Replaced the sensor and started it after deleting all codes. Still no response or barely any from gas pedal. Have these codes now.
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Friday, September 29th, 2023 AT 3:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

When you say little to no response from the throttle, can you record it and upload it for me to see and hear? The one code, 120408, is usually caused by something internal. We may need to check the timing chain. Something is causing the intake cam sensor code.

Let me know.

Joe
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Saturday, September 30th, 2023 AT 9:00 PM

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