SOURCE: oil pressure gauge suddenly reads maximum
Are you referring to the oil pressure gauge on the dash? If so, that is most likely the oil pressure sending unit having gone bad. The sensor runs about $40 - 50 (at least the last time I had to replace one on that engine). They are not terribly difficult to replace and I believe its a three wire sensor located back side of the engine, on the passenger side area. Its in a kind of tight spot and takes a bit to get it completely screwed out, but it can be done.
When they go bad, they typically will cause the gauge on the dash to read maximum oil pressure. You should be okay to run like that until you can get a new sensor as long as it is reading maximum oil pressure on the gauge and not low or no oil pressure on the gauge.
SOURCE: Pontiac Bonneville(2000) oil pressure sending unit
The oil pressure sending unit is located behind the oil filter, Threaded into an aluminunm housing. It has wiring that plugs into the sending unit. The oil filter has to be removed and you will need a deep well socket and a 6 inch extension. Change the oil and the sending unit together.
SOURCE: changing the oil pressure sending unit on a 1996 2.2 pontiac sunf
Under hood, driver side, front engine area, below cylinder head, where engine meets transaxle housing mounted in block
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SOURCE: Pontiac Bonneville 2003 oil pressure 120/// and maf sensor code
Replace oil pressure sensor. What is the code?
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