Master recommendation for anti pollition

This week, when the engine was cold, my vehicle gave an anti pollution and then catalytic convector error. When the engine temperature was over 70, I continued without errors when the car stopped and started. When I got an error, the car was singing, not accelerating, there was no information on the trip computer. Error code p1340 of Obd device. Is there a master you recommend in Izmir :) vehicle 2004 307 sw automatic

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