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Either the pressure sensor is clogged or defective or the oil pump needs replacement.
Have oil pressure checked with a gauge. There by you remove the sensor to do this and see what you get for pressure. If pressure is ok by specs then sensor was clogged. If not replace pump. Not a biggie in this car.
Indication of wear within the engine. Most probably worn main bearings. First off, did you use the correct grade oil with the last oil change? If yes, get that engine out, have the crankshaft resized(entails grinding the journals to a slightly smaller diametre) and fit oversize crank bearings. While you're at it and the engine is out you may as well swop out the oil pump, saving you much time and money in the long run.
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if you have a 4jx1 3.0 engine then the engine wont run properly because engine oil pressure is what drives the direct injection system.
Check for blocked oil filters 2 pieces if not remove the oil pan and check the oil pickup tube for oil sludge blockage
in a shop we ignore the dash gauges and use REAL gauges.
we attach a real gauge to the sender port. on engine block. and read the true pressure.
the lamp on most cars go on at 3 to 5psi.
this is catastrophic failure. that low.
my guess, is you let oil drop and you wrecked bearings.
but let the real gauge prove that , dont guess.
Your first order of business is to check the oil level in the crankcase, and bring it up to full level. You can probably find a replacement dip stick, or go to a junkyard and get one. Without sufficient oil in the engine, The will seize. or prematurely die.
Is your check oil light coming on? Have the car scanned for trouble codes. Auto Zone and Advance Auto will a scan. Then you will be able to get info on the codes and what they identify. Just look the codes up on an internet search.
This is not necessarily a problem. If the oil is at correct level and viscosity grade, and the light always goes out with a small (not large) rise in revs, then it could possibly be OK. An engine does not need much oil pressure at idle, say 600-800 RPM.
It could also be a faulty sender unit on the engine, a worn oil pump, or a faulty oil pressure relief valve on the oil pump or in the filter.
To be sure, get an oil pressure gauge fitted to the sender outlet hole, and see what the reading is at various revs. If there is indeed a pressure problem by the gauge, try first a new oil filter. If not it is probably a faulty sender unit.
It sounds as if the clearance that the bearings normally run in have been surpassed and need to be replaced. Higher engine revs will supply extra oil which will overcome any small discrepencies but constant running at this stage will result in faster degradation of all engine components concerned resulting in a more expensive repair. Shes basically worn out.
Maybe your engine is idling too slowly, If the revs are below say 700rpm the low pressure warning light could come on especially when the engine is hot.. If the idle speed is ok try a heavier grade of oil in the engine. Next try a new oil pressure sensor. It's got to be one of these things. Check the engine running temperature . An over-hot engine will cause the oil light to come on too.
That sounds like you bought big problems. Oil ights indicate low oil pressure= BIG BUCKS. I would have a qualified repair shop check it out, A shop that specializes in BMW. If you are lucky, maybe the oil sender is just bad. They can also check out the Ck eng light. But the oil light is priority one.
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