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Hi, I have a 98 S70 glt and have a check engine message P0172 for rich mixture. It was originally associated with an O2 sensor low voltage message too. I have replaced the O2 sensor and now I still have the P0172 message. I've had a shop look at it and they checked all of the vacuum hoses and they think that it is the fuel regulator or damper. Though it could also possibly be the Mass Airflow Sensor or maybe even the fuel injectors. I think that most likely it is the fuel regulator or damper though, do you have any ideas on how to check these or should I just simply start with the regulator and see if replacing that works? Thanks
 

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You don't want to randomly start buying and replacing non-returnable, expensive parts. Could be a pricey job.
If your shop is Volvo friendly, they may have a collection of substitute parts to trouble shoot the issue. It's an old enough model that the parts you need could easily be found in the wrecking yard so you could substitute youself.
 

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I had to replace the PVC vaccumm plumbing I got the complete parts list for IPDUSA.com It will take you the better part of the day you will need the car to be cool you have to remove the exhuast manifold
 
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