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The gas or petrol cap is a good idea. Removing the coil pack(s), on cylinder 1, is another one. Sometimes you can easily find an electrical connector - say the O2 sensor - and disconnect it. This, of course, depends on what connectors are easily reachable. On a Hyundai Coupe, the O2 sensor is easily accessible.


The easiest thing I can think of is to remove the gas cap and start the engine. You should quickly see a MIL. The scan tool should report something like Evap emission fault large leak.

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