Question about 1995 Volkswagen Jetta

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Oil light The oil light always starts sounding (the red one that indicates it exists a problem). So, first I bought a oil sender unit and have installed it by a guy who knows about remained the same... then my mechanical told me to buy a more viscous oil...I did it and put into my car...I measured the oil level...and it remains the red light of the oil sounding... I don't know if you could have in mind maybe what it could be the problem ? Thank you.

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You have low oil pressure, either due to a bad oil pump or worn engine bearings such as rods, crank. do you have any engine noise yet?
Buy a mechanical tester oil guage and test the pressure, it should be over 20 PSI at idle, the light is triggered at or below 10 PSI I believe.

Posted on Aug 27, 2008


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Where "exactly" is the oil sending unit?

the oil sender unit is screwed into the main oil galley of the engine block ans is in fact either a variable resistor for oil gauges or a pressure switch for oil lights
It normally has one wire from the gauge or light and is grounded out through the body of the unit
if the oil light stays on it indicates either a faulty sender unit or the wire is grounding out before the sender unit
do not confuse this unit with an oil sensor unit which has more wires and communicates with the ECM to report temperature and oil levels and pressures ( depending on the make of vehicle ) that will put on the MIL light or place the engine into limp mode

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It is a warning for oil pressure. Stop, don't drive, check oil level on the dipstick, if it's ok, check to see if the connector on the oil sender unit has not come loose and is touching somewhere in the engine. It could also be a faulty oil sender. If all this is "Greek" to you, get a mechanic to check it out

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It's a warning light system that no oil pressure exists. If it doesn't work, it won't cause damage, you just won't know if and when your oil pressure is lost. The sensor or sender unit is very inexpensive on most vehicles, like under $10.
All the sender does is cause the oil light to go off when it detects minimal pressure. A valve inside the sender moves and causes the sender to stop grounding the warning light, and so the light goes off.

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Sound like a posible bad oil pressure sending unit . It is normal for pressure to be above normal just after starting . At a cold idle , the oil viscosity is higher than it would be if it were warm . If the guage is reading really high for longer than normal ( after 1 minute of cold idle ) then I suggest having the sending unit checked .A sevice center can check the sending unit on or off the vehicle as well as checking pressure with an actual guage for more accurate readings .

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My son just bought a 1986 cadillac deville and the "stop engine oil" light comes on whenever he stops the car. Any ideas, a bad sensor, I hopr?

Well, if you say that when he stops the car, but the engine still running (idling) - that "stop engine oil" light comes on, it could mean that the oil pump can no longer maintain the minimum oil pressure to the critical areas of the motor at an idle.
If the light goes out with a higher idle (driving the car) that is a good indication of a worn out motor.
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1 Answer

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The oil pressure sender unit is located on the oil filter housing.These do tend to leak at times. The warning light for this switch is a red oil can and a buzzer. Replace the switch. If warning light still comes on, have the oil pressure checked. The oil level sender warning light is an orange oil can with oil level under it. This sender is fitted on the bottom of the oil sump and can leak past the seal. If warning light comes on, check oil level. If ok, check for damage to wiring under vehicle. Senders do some times become faulty.

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1 Answer

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This could be warning you of dangerously low oil pressure , which could damage your engine , or perhaps the oil pressure sender unit is not working. It is an inexpensive part , and easy to install.
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I think you have a suspect oil pressure sender unit. Replace it as they are cheap and need to be reliable and it will be cheaper than getting the oil pressure tested. If the light still stays on with the new sender you may have internal wear or a partial blockage. If the light stays on you need to have it urgently checked by a mechanic or you could risk serious engine damage.

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