Well i hope its not the oil pump because the oil pump works with the speed of the engine when it turns and as you know when the engine turns fast the oil pump turns fast too and the more you accelerate the faster the oil pump turns, that means there is more pressure of the oil to go up top the engine and when the engine idles, The pump turns slowly, and doesnt pump enough oil up top the engine and the oil pressure switch dosent detect any oil passing by then it send a message that the pressure is low. So check your oil pressure during idle. Good luck Bro
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