EGT Issue and cold start

Well I got a CEL last week in my B5.5V last week, G235 short to plus P0546. I inspected the line and everything from the sensor, no loose connections and also did the same again with Sailor 1854 we everything seemed to be in place, he scanned and tried to clear code, but it is a hard fault. Should EGT sensor be replaced? That was Friday, no difference in how the car was running.
Also, starting this Monday, when temps dip into the 40s in the AM, when I would start the car and start driving, there is no throttle response, after about 20ft it starts to work and works fine the rest of the day

No issues today, it was 57F this morning

No suggestions? I still get the issue under 50 degrees.

Short to plus may be a harness or wiring issue. Disconnect sensor and see if code comes back immediately.

While it is acting up check the wires from the ECU plug to the sensor for connectivity, short to plus.