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Electrical verification with a PICO oscilloscope of the efficiency of a three-way catalytic converter in a Magneti Marelli 4LV engine management system. -Explanation of the particularities of the operation of the first broadband lambda probe in this Magneti Marelli 4LV engine management system. -Connection of the PICO oscilloscope to capture the pumping signal of the first lambda probe. Analysis of the pumping voltage values. -Connection of the PICO oscilloscope to capture the voltage signal of the second jump lambda probe. Analysis of the voltage oscillogram obtained. -Explanation of the function of the three-way catalytic converter. -Verification of the efficiency of the three-way catalyst using exhaust gas analysis (Capelec CAP32001EX-G Analyzer) and the signals measured with an oscilloscope (PICO Oscilloscope) of the pumping voltage output of the first lambda probe and the output voltage of the second jump lambda probe placed after the catalyst. -Verification and analysis of the voltage values of the two probes and the behavior of the exhaust gases under different running conditions. -Explanation of the actual connections and identification of the colors of the broadband probe cables. We carry out the tests with a PICO PQ178 oscilloscope. The product link is this https://www.miac.es/tienda-producto-v... We carry out the tests with a Capelec gas analyzer. The product link is this. https://www.miac.es/tienda-producto-v...