Took mine for a test ride today. I ride several days last week in the cold. It didn’t sound right so I checked the codes. I had P1353 and P1356, no combustion. I don’t have a CEL so I started researching. According to my service manual and internet research, plugs and wires were most common. So last night I pulled the plugs and wires. Plugs looked good but were not gapped correctly. I guess they didn’t check them when they changed them during the 50k service. I also noticed some rub marks on the wires. Nothing deep or showing wire. I just put some tape over the spots, gapped and reinstalled the plugs. Took it out today and ran it pretty hard and the codes did not come back. I was able to repeat the codes last week just from work to home and home to work. I also wonder of it being 25 degrees last week had anything to do with it. Anyways all is well now. Plug gap is important with the ion sensors.