Hi all. I Hope you guys can help with this. I am getting an intermittent fault starting the car from cold. P0426 Catalyst Temperature Sensor Range/Performance (Bank 1) If I reset it it stays off for a while but ultimately comes back. From what I have read so far it sounds like and oxygen sensor on the exhaust. Has anyone had experience with this who could provide any advice? Would appreciate any help you can provide. Car is a 2009 W204 C220cdi Sport (not Blue Efficiency) Thanks in advance.