I want to know how can i manually start my Malfunction Engine Light (Check Engine Light) ? i actually want to generate a DTC so that i can see it on a OBD Scanner. I know even altering or removing/cutting any sensor will probably generate a DTC but i want a solution which is easy, doesnt require any cutting and DTC is generated fast.
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.