With several of our identical company vehicles with petrol engines (2011, 130,000 – 145,000 pure city kilometers), the engine control lights are almost reproducible (medium speed, light load). Legal errors: Catalyst effect too low. Nevertheless, the AU is always reached with best values, i.e. CO close to the zero limit, HC also few ppm. Now I would be interested: Are the OBD systems (catalyst test by additional lambda probe) often too sensitive out Since it concerns three identical vehicles, it should not be a single error.