Check engine light on Volvo s 40 1.9 turbo. Code 64

What is your question?

2004 S 40 1.9 turbo Volvo Check engine light Code 64. Come on for a while then goes off. When i first start the car it fumbles. I upper catlelactic converter was replaced. Waiting for an O 2 sensor on order to be put in.

What makes this problem better or worse?

First start in the morning engine light comes on

How long has your 2004 Volvo S40 had this problem?

not sure if new problem since cat was replaces.