You did not indicate the specific engine in your PT Cruiser. Do you have the 2.4 liter 4 cylinder turbo engine?
Code P0129 indicates out of range on the barometric pressure sensor. When you performed the head gasket replacement maybe a wiring connector was not reattached to the MAP sensor or the throttle inlet pressure sensor or a vacuum hose is dislodged or broken.
Code P0129 indicates out of range on the barometric pressure sensor. When you performed the head gasket replacement maybe a wiring connector was not reattached to the MAP sensor or the throttle inlet pressure sensor or a vacuum hose is dislodged or broken.