Lexus CT200h violent shuddering and misfiring engine requiring head gasket repair on Lexus CT200h

Some Lexus CT200h owners report experiencing violent shuddering and misfiring, particularly in models from 2011 to 2013, especially in temperatures below 45F. This misfiring can lead to rough idling and stalling, which are common symptoms associated with the issue. Additionally, some owners have noted that the need for head gasket repair may arise from engine problems such as cold start knocking and rough idle, which can worsen over time, particularly in older models. Furthermore, repair costs at Lexus dealerships for these issues can be significant, emphasizing the need for timely maintenance to prevent escalating expenses and enhance the overall driving experience. Addressing these concerns promptly is crucial for ensuring smoother operation of the vehicle.