Methods and systems for disabling a fuel shut-off state of a vehicle. The test enabling module is configured for assessing a reliability of an estimated level of reductant load on an after-treatment component, and, based on the reliability, selectively facilitating disablement of a subsequent test for determining an efficiency of NOx reduction in the after-treatment component. A classification circuit classifies the specified pixel based on the class tap. The geometry of the test station and fluid distribution channels assures isobaric conditions throughout the testing areas. By means of detents on the pressure element and detents on the cable outlet connection piece that cooperates therewith, a release of the threads screwed together is prevented.