Check Engine Light P0172 bank 1 system too rich? - Volvo Forums - Volvo Enthusiasts Forum

Volvo S70 Made from 1998 to 2000, this sporty model replaced the 850 sedan and instantly became a hit.

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Old 10-04-2010, 06:44 PM
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Default Check Engine Light P0172 bank 1 system too rich?

Anyone have any answers
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Old 10-04-2010, 09:10 PM
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Location: Albuquerque, NM
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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.
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Old 10-20-2010, 03:06 AM
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Default same problem

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.
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Old 11-02-2010, 10:01 PM
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Default Same for me

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.

Last edited by Tdog; 11-02-2010 at 10:17 PM. Reason: too much info
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Old 11-04-2010, 11:56 AM
Join Date: May 2010
Location: VA, US
Posts: 72

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

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.

Last edited by t5ftw; 11-04-2010 at 12:03 PM.
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Old 11-08-2010, 07:33 PM
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Posts: 29

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 :-)
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