I am not well versed with Volvo, I have seen problems with poor quality reman units but you say these are OEM Bosch. I have seen computer reflashes on some cars to recalibrate the air flow meters. There is a professional service called Identafix. http://www.identifix.com/info/about_us.htm They only deal with professional repair shops. They are in the Minnesota 651-633-8007 begin_of_the_skype_highlighting 651-633-8007 end_of_the_skype_highlighting. Your auto repair shop do all their diagnosis tests, and discuss your problem with a team of professional technicians great service cheap and very bright people. If the repair shop that are repairing your car are stumped this is a great service. This company only deal with automotive repair shops and don't answer questions for the general public but are an amazing knowledge base. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online
Does anyone at your shop have axcess to iATN? international Automotive Technician Network.
check your oil trap.. it will trip codes..if u have oil/smoke coming up from your dipstick,,your oil trap is full and to be replace ,,45/57$ for the part,,550 750 for labor..diy..priceless..its not a hard job,, you just have to pay attention..
