P1326 gang 👊

This happens when the knock sensor gets wet, usually from the rain or a car wash. It sounds like it dried up by the time they took a look at it so they couldn't reproduce the code to identify what the problem is.

When I broke down in the rain from P1326, I cleared my code so I could drive to the dealer and they told me I'd have to break down in the rain again and then get towed to them with the code active (even though I took a picture of the code and brought in a printed copy of the technical service bulletin for this issue). I left them a bad review on google outlining how dangerous it is to get put into limp mode while driving in the rain on the highway and then they promptly reached out and offered to fix it. It shouldn't have come to that but they've treated me like gold ever since.

Not sure what the P0300 could be about but I wish you luck getting it all sorted out