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Code 2f52 with no check engine light?

Tiny
BHAMDOC1973
  • MEMBER
  • 2012 MINI COOPER
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 104,000 MILES
Had several codes which are shown. Deleted all and restarted and only have this code 2f52 with no check engine light.
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Friday, December 22nd, 2023 AT 9:37 AM

5 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,389 POSTS
Here is information on the code:

The fault code 2F52 "Super knocking detection."

Does the engine run? We need more information to help you. If the engine runs and sounds okay, I would lean towards a bad PCM. Can you upload a video of the engine cranking over/running please?
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Friday, December 22nd, 2023 AT 12:32 PM
Tiny
BHAMDOC1973
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Car drives fine yes.
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Friday, December 22nd, 2023 AT 12:58 PM
Tiny
KEN L
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Okay, let's swap out the knock sensor to see if that fixes it which it should. Here is the location of the sensor. Also, the sensor might just be loose, which will cause this problem as well. Check out the images (below). Let us know how it goes.
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Saturday, December 23rd, 2023 AT 10:27 AM
Tiny
BHAMDOC1973
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  • 1,657 POSTS
Okay, will do. Why is it that they can go bad without a knocking engine? Isn't its job to give out the code when there is a knock? I replaced many on different cars that had zero issues and it made a day and night difference.
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Saturday, December 23rd, 2023 AT 12:56 PM
Tiny
KEN L
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The codes will only come up when the knock cannot be controlled. Let us know after you check out the sensor.
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Tuesday, December 26th, 2023 AT 9:27 AM

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