i had this probleme before but after about 2h it started but now there is nothing.?

hi i have a BME E36 323. after washing the car cranks but does not start. i had this probleme before but after about 2h it started but now there is nothing. i did check everything and all i could find that there was no spark. could it be a sensor or what would you sugest

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[Kerry at Pelican Parts]

Check the crank sensor and main relay a bad main relay can cause similar problems

- Kerry