Impala low engine oil pressure
Could be oil pooling in the valve cover caused by a partial blockage of the drain gallery, but you'd almost certainly get a oil low message too. I assume the oil and filter is changed regularly? You could try adding Marvel Mystery Oil, about 12oz for about a hundred miles and then change the oil and filter. Depending on your level of adventurism, you could drain the oil and replace it with new oil, except add a quart of automatic transmission fluid in place of one quart of oil. Some people say ATF is bad for seals, some people use ATF to rejuvenate leaking seals. I don't know who to believe. Run that for 100 miles and change the oil and filter. I've even seen someone replace their oil with kerosene and a quart of oil and run it at idle for 5 minutes, then change the oil and filter. Instantly freed 2 stuck lifters and the engine was fine.
Best bet would be to run the Marvel Mystery Oil first. Then, if the problem persists, either change the pressure sensor and see where that gets you or go for the ATF in the oil trick.
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