See my answer to your related/same question which I include again for your reference:
You must immediately check your engine oil level and take appropriate action: unless you have a defective oil pressure sensor, oil pressure light usually indicates that your engine oil is not flowing properly. Some possible issues: low oil level (leaking engine?), blocked oil filter (when did you last get your car service) or defective or blocked oil pump due to excessive dirty engine oil.
Also check under your car to see if you have any oil leaks: this usually indicate that you have defective engine gaskets or oil seals causing your oil (pressure) warning light to come on.
Hope it is of assistance. But I would consult a motor mechanic asap as you engine could soon fail due to the lack adequate oil lubrication.
Also, check the oil for coolant contamination. A lot of these engines will leak coolant into the oil at the intake manifold gasket, making the oil foam up and lose pressure
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