Gary, there is good news for you yet. If you go to your nearest AutoZone and ask for OBDII scanners, they should point you to a few of them. I bought an Actron scanner model CP9035 for something like $150 ($199 on Actron website). This scanner WILL NOT read out the codes from your car (it'll indicate no DTCs), but it WILL clear your check engine light if you follow the instructions for clearing the codes in the scanner's manual (I think you hold the "ERASE" button for a few seconds).
Not sure if this is helpful, but you will have a $150 gadget to turn off your CE light off without dealer's help. The reason the codes don't show up is IMO that the OBDII codes nomenclature is not standard, it is a RECOMENDATION that most manufacturers follow. Volvo happens to not follow this recommendation. But since US govmnt requires it CE light will go on for the slightest of reasons. Anyway the Actron unit WILL definitely clear the light for you.
BTW, if you live in Boston area, email me and maybe you can use mine.
Good luck.
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