Anyone have any answers

 

Please leave details about your car when you post. That code is usually linked to a loose vacuum line. Often my vacuum line that connects to my PCV has come loose.

 

I have a 98 s70 and i have that code pop up from time to time. i have replaced both o2 censers. It all started after i replaced my cat it was plugged up. and i have had to replace the flex pipe.

 

Please let me know where to locate the PVC Hose. This is happeng at 840 RPM Here's the stats: This is my first post so if this is too much info, just let me know: Replaced both 02 sensors last year and MAF 3 years ago-

Freeze Frame Information:
1. DTC for which Freeze Frame was Stored - P0172.
2. Fuel System 1 Status - Closed Loop - Fault With At Least One Oxygen Sensor.
3. Fuel System 2 Status - Not Supported.
4. Calculated LOAD Value - 2.75 %.
5. Engine Coolant Temp - 210.20 °F.
6. Short Term Fuel Trim - Bank 1 - 6.25 %.
7. Long Term Fuel Trim - Bank 1 - -5.47 %.
8. Engine RPM - 840.00 Rpm.
9. Vehicle Speed Sensor - 0.00 Mph.

 

Model year and mileage could be useful to guess what is going on.
BTW, I am no mechanic nor car expert. I am just a new Volvo owner who is struggling to keep my car on the road. What I notice unusual from my experience is that your LTFT is negative while you get rich condition code.
If it was from vacuum leak, I would expect a lot higher LTFT, as ECU would trying to compensate un-metered air.

So, what I would rather guess is something like this
https://volvoforums.com/forum/showth...ighlight=p0172

Well, I have to admit that this still does not make clear sense because your problem is under idling not under boosting.
In addition, if I have to use silicone sealer, I would use sensor-safe one.

 

Appreciate the feedback, mine is a base model, by accident I found a hose from the intake manifold that goes to the evap valve that was original and virtually fell apart while checking it. Replaced and so far no code :-)