Question about 2001 Pontiac Bonneville
Reads oil low but oils ok could it be faulty pressure switch
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Posted on Jan 02, 2017
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.
Posted on Jan 04, 2009
SOURCE: High oil pressure reading
Hi, this is a oil pressure sensor malfunction. the gauge is getting a distorted reading from the sensor. replacing the gauge will fix this issue. also, check the fuse box for blown fuses.
Posted on Mar 01, 2009
The oil sending unit has gone bad and needs to be replaced. The sensor is under the exhaust manifold and above the oil filter on the V6. Replace the oil pressure sending unit, once they fail they may start to leak oil soon. Good luck and keep me posted.
Posted on Jun 29, 2009
SOURCE: Oil Pressure Guage
Oil pressure is read by the sending unit, not created by it. If you replaced the sender and do not see a minimum of 20psi there is something wrong inside the engine.Some people will tell you that 5psi is "safe". In reality, in an otherwise perfect engine it may be but in real world application, the 20psi number is the lowest I'd ever accept in any engine.(at idle) Running pressure is influenced by temperature and oil grade, but this should not vary dramatically.
It is best to attach a mechanical oil pressure gauge to the engine and in that way, you can read the exact pressure. If the mechanical gauge reads the same or very close to what you see on the dash, then the reading is correct and if low you will need further diagnosis to determine why.
Posted on Oct 20, 2009
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