Chrisd

First bmw I’ve owned so not clued up on them at all so could do with some advice my 116i struggle to start from cold some times taking 2-3 mins but once it’s started it seems to run fine till about a mile down the road regardless of driving style the CEL will come on with error code P13B6. The car seems like it continues to run fine. Anyone had this before ?? Or know any fixes for it ?? any help and advice is appreciated