I was attempting to get the Jetta inspected today, so naturally this happened.
It threw the code a few days ago, P1296 for a vague cooling system issue. I replaced the coolant temp sensor this morning, cleared the codes, and didn’t drive it enough for the I/M monitors to reset before the code came back on. So now I have to replace the thermostat, which isn’t fun on this car.
The car is also still running poorly from 1500-2500 rpm under boost when warm, I’m hoping the thermostat helps because it runs great when it’s cold. If not, coils/plugs will be the next thing on order.