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Code P2185, coolant sensor?

Tiny
BHAMDOC1973
  • MEMBER
  • 2015 AUDI A3
  • 1.8L
  • 4 CYL
  • TURBO
  • 2WD
  • AUTOMATIC
  • 127,000 MILES
I watched temperature and it's still in the middle. Coolant shows 21.7 c on the scanner though which doesn't seem right. Where is the sensor and would you suggest a malfunctioning sensor based on this? This is the 1.8l motor.
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Sunday, October 22nd, 2023 AT 5:26 PM

11 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,709 POSTS
Hi,

There are two coolant temperature sensors on this vehicle. One is on the cylinder head and the other is on the radiator. See pic 1 below.

The code you have is related to the one on the radiator. Keep in mind, the sensor on the cylinder head provides the information needed for the gauge. The one on the radiator is related to the cooling fans.

I attached the diagnostics below. Take a look through them and let me know if you are comfortable performing them.

Let me know.

Joe

See pics below.
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Sunday, October 22nd, 2023 AT 9:58 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,557 POSTS
Battery needs a jump, so I will check that as well.
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Monday, October 23rd, 2023 AT 4:58 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,526 POSTS
Please so and let us know.
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Monday, October 23rd, 2023 AT 12:13 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,557 POSTS
Changed sensor, still monitoring it. At what temperature does the fan come on?
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Friday, October 27th, 2023 AT 6:26 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,557 POSTS
Fully warm.
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Friday, October 27th, 2023 AT 6:28 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,557 POSTS
Also, since starting the car the temperature symbol is on all the time.
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Friday, October 27th, 2023 AT 6:50 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,557 POSTS
I also can't tell from the picture on which side of head is sensor?
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Friday, October 27th, 2023 AT 6:51 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,557 POSTS
Coolant fan came on at 104c. Symbol still on. The reservoir is not full, maybe that's why. I'll fill it when it's cold.
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Friday, October 27th, 2023 AT 7:00 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,526 POSTS
Yep, if the coolant is low it will have this light on.
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Friday, October 27th, 2023 AT 8:31 AM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,557 POSTS
Added coolant, all good. Thanks
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Friday, October 27th, 2023 AT 8:38 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,526 POSTS
Good to hear, please use 2CarPros anytime we are here to help.
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Friday, October 27th, 2023 AT 8:41 AM

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