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I think it is safer to run the tests from within the software, because you can change the parameters under the control of the ECU based on real data, by changing the resistance of the signal the data coming to the ECU will not match reality I think you can play with the AFR. On the internet you can find many products for cheating ECU by connecting various types of emulators that falsify the signal, but in fact it is just a bulshit, because real tuning always involves change of map calibration, because in case of damage to one of the sensors Ecu should go into emergency mode, which involves loss of power, and if any system such as change of cylinder capacity, change of exhaust or intake was changed then the emergency map can damage such an engine.Because the mixture will be too rich or too poor.
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