O2 Sensor fault after new cat/exhaust

I've recently had a new stainless backbox fitted (went for the Cybox one in the end), and due to the amount of rust needed the cat changing as well. Since then I've had the engine management light on with fault 'P0130 - O2 Circuit Bank 1 Sensor 1'. If I reset it, it comes back after a few miles.



Does it take a while for cats to run in, or is there some other problem?

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