Volvo Troubleshooting Questions? Ask a Mechanic for Answers ASAP
The "Reduced Engine Performance" message can be caused by several things. For example, a mass airflow sensor, oxygen sensor, intake pressure sensor, etc. It can also be caused by a vacuum leak. The only way to tell is to have the diagnostic trouble codes checked and go from there. I'm certain the Volvo dealership will know how to handle your concern once they have the trouble codes.