Glow plug with pressure sensor for a diesel engine

The plug has a plug body inserted into a cylinder of a diesel engine. A heating rod (1) displaceably arranged in the plug body slides in an axial direction in response to the plug body. A pressure sensor (7) is arranged between the heating rod and the plug body under an initial tension. A seal in form of a bellows-shaped component (2) is provided between the heating rod and the plug body.