low oil pressure at idle
you need to see what your actual oil pressure is at idle, remove the sensor and check to see what the oil pressure is, if it is good change the oil pressure sending unit
StevenBoussey is spot-on. But what rpm is idle?
Does your car have high miles or have you driven it really hard? It could be engine wear of just a bad sender unit. Change the oil and filter while you are at it.
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