Yesterday, about 20 miles into a 55 mile trip to work the oil pressure light came on. The gauge read around 55-60, and yes I know it's kind of a dummy. Kept driving since no other codes, engine sounded OK. Coming back home, same thing. After about 24 miles, light came on but no codes, engine sounds fine. Going to replace oil pressure switch, hopefully that's the problem. I am 3rd owner, purchased with 117K miles. Changed oil at purchase, and twice since. Now around 133K, virtually all highway. Car Fax that came with car shows regular oil changes. Hope this will be a cheap fix, still have the transfer case problem.