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Code P0172, system too rich?

Tiny
BHAMDOC1973
  • MEMBER
  • 2010 VOLVO XC60
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 132,000 MILES
It had this code and the other one which has to do with catalyst efficiency that is pretty much on most cars nowadays. When I delete them and start the code this p0172 comes back alone pretty much within 3 seconds of starting. Where should I look?
Saturday, September 21st, 2024 AT 1:38 PM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 48,363 POSTS
A P0172 code on a 2010 Volvo XC60 indicates that the engine control module (ECM) has detected that the fuel mixture is too rich on Bank 1.

I have seen the engine coolant sensor cause this issue or a leaky fuel injector, I would remove the spark plugs to see if one of them is dark, this will be the cylinder with the bad fuel injector.

What reading does the scanner say is the temperature of the coolant sensor? Here is the location in case it is way off.

This guide can help as well:

https://www.2carpros.com/articles/why-an-automotive-engine-will-run-rich

Check out the images (below). Please let us know what happens.

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Sunday, September 22nd, 2024 AT 10:30 AM
Tiny
BHAMDOC1973
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  • 1,656 POSTS
One picture show what looks like a power steering reservoir. Do you mean it's in the coolant reservoir?
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Sunday, September 22nd, 2024 AT 10:33 AM
Tiny
BHAMDOC1973
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Also, there is no idling issue or a misfire or an injector code.
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Sunday, September 22nd, 2024 AT 10:36 AM
Tiny
KEN L
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That's a good sign it is not an injector, it looks like the coolant sensor is behind the power steering reservoir.
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Monday, September 23rd, 2024 AT 9:12 AM
Tiny
BHAMDOC1973
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  • 1,656 POSTS
I'll check it. I have a feeling this a PCV issue, but I will see what the scanner says about the temperature on start.
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Monday, September 23rd, 2024 AT 10:38 AM
Tiny
KEN L
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Sounds good, let me know.
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Monday, September 23rd, 2024 AT 1:16 PM
Tiny
BHAMDOC1973
  • MEMBER
  • 1,656 POSTS
Went to check the pcv which is on top of the motor, found the small hose that goes from it to the intake long plastic tube off, it slipped off. Changed the clamp and it's all good now.
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Wednesday, September 25th, 2024 AT 5:37 PM
Tiny
KEN L
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  • 48,363 POSTS
Thanks for letting us know, we are here to help, please use 2CarPros anytime.
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Thursday, September 26th, 2024 AT 11:40 AM

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