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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.
Did you compare what your dash gauge read when it was acting up and compare it to the manual gauge at the same time? I know you said you used the manual gauge and it read fine so if you get a proper reading out of the manual gauge and an improper reading out of the dash gauge then your dash gauge needs addressed.
Have you checked your thermostat. Some cars do not have gauges for all componants of the car located on the dash board. A bad thermostat could drive the oil pressure gauge up, if there is not a coolant level gauge on the dash board.
That is a manufacturing defect associated with your instrument cluster. My local dealer replaced my entire instrument cluster for free (truck was out of warranty) when my speedometer showed 100 mph in a parking lot and my oil pressure gauge read 0.
Check for fuses and fusible links that may be tripped or blown.
Next, check for grounding issues someplace easy to reach like the heated seat connectors.
Most dummy lights work by choosing the warning light path over the circuit path when the circuit path is higher resistance. Which may explain your dash warning lights.
So, what I am trying to say is...you are looking for a open ground in a big big place....like under the hood at one of the major fuse/relay/fusible link points.
Most important thing you need to do is to establish the actual oil pressure. put a mechanical gauge on the engine and read real oil pressure. If pressure is low (min is 15psi, I prefer to see at least 20 at idle) there is an internal problem...bearings etc. If pressure is good, sending unit has failed...replace it. I would not drive it 'till the oil pressure is verified as being safe. You might get lucky and someone just forgot to plug in the sending unit, but it must be checked!!! good luck
lift the carpet at o/s/f {drivers front footwell} there is two multiblock connecters guarenteed tobe sodden with water disconnect connectors& dry with a hair dryer on low setting hopefully the pins are not corroded reconnect connectors this is aknown fault i have worked with peugeot&citroen for 24 years kind regards alastair
Have you checked the oil ?
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