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In gasoline and diesel cars, the gas emission test consists of insert a probe into the exhaust pipe, with the engine warm. However, for diesel vehicles, a sample is taken of the fumes that are emitted from idling to disconnection speed (the well-known accelerations), to analyze the particles present in the emitted gases and determine if they are within the legal limits. .
Specifically, according to TÜV Rheinland, in gasoline vehicles, with the engine idling, the volume of carbon monoxide (CO) declared by the vehicle manufacturer is measured. If this data is not available, for vehicles with an advanced emission control system (approximately from 1992) this value may not exceed 0.5%.
In vehicles registered from July 2002 to the present, this value must not exceed the limit of 0.3%. These limits are different and more permissive for vehicles without an advanced emission control system, that is, those vehicles registered before 1992.
During the second part of the gasoline vehicle test, with the engine revved up, the carbon monoxide data obtained cannot exceed 0.3%. For vehicles registered after July 2002, it cannot exceed 0.2% CO.
On the other hand, 100% electric vehicles are exempt from passing this test since their power plant does not emit any type of pollutant to the environment. Meanwhile, for hybrid vehicles, the current legislation does not include notable variations with respect to their tests, which are carried out in a very similar way to combustion vehicles. The main difference is that, during the test with the engine idling, the manufacturer’s protocols are followed so that the electric motor is not activated, as it would be in normal circulation, but rather the combustion motor, in order to carry out the measurement.
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