I would like to know if it can be the oil pressure or the coils??
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SOURCE: 2004 GMC Sierra High Oil Pressure
if it is electrical oil pressure sensor I would start there. The best way to see if you have a major problem is to use a mechanical oil pressure tester. Take off the oil pressure sensor and put the mechanical tester on. The tester should come with a Gage. If it comes within your trucks oil pressure range than all is fine and replace the sending unit and see if that don't help your problem.If the tester runs high then the oil pump is bad or your cam-bearings could be the problem. But with cam-bearings you would usually get a low reading.
check your rear mains
SOURCE: VW 1.6 2002 MODEL CLASSIC POLO OIL LIGHT PROBLEM
Clogged oil pick up.... Or pump. Remove oil pan n have a look.
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