Volvo Troubleshooting Questions? Ask a Mechanic for Answers ASAP
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If you have not had the fuel injectors tested this should be done.I have seen several cases where one or more fuel injectors may not atomize correctly and will cause this type of fault here needing either cleaned or replaced to correct this fault.In some cases you can add cleaner to the fuel tank with the tank at 1/4 tank and run to near empty and repeat to clean these yourself.I would have this checked into to see if this is the cause here.
Most likely a scan tool was used to try and read out the codes that was not fully compatible with your model and may be why no codes were found.If you know for sure it was a compatible scan tool there is a chance that the engine computer is at fault causing the check engine light and rough running needing replaced.
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