Question about 1994 Jeep Grand Cherokee

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I have a new problem with my oil pressure sending unit. It seems that the unit is fine, but the actual electrical connection from the wiring harness is where the oil is leaking from. Where the two wires go into the connector, they have a white rubber grommet separating positive from the ground and acts as a seal for the connector. Do they offer these new or am I stuck going to a salvage yard?

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  • warpig7573 May 11, 2009

    It is leaking oil, that is the main problem. I need to know if the part of the sensor that is connector to the wiring harness, the part that plugs into the sensor, is available at a parts store or if I would be required to buy a whole new wiring harness.

  • warpig7573 May 13, 2009

    It's in the dash from the factory and, there is only one wire. I'm not positive if it is a small hose or if it is a wire. My first instinct was that it is a wire sending a signal to the meter on the dash, but it could be a small hose. It is grayish in color, could have been white and just turned gray because of the oil leaking onto it. It connects as a clip, sort of like the one for a taillight, only it is about 1 1/4" long.

  • Ned C Cook
    Ned C Cook May 11, 2010

    Disconnect the two wires, clean off the senseder and start engine if it wont start, plug the wires back on , start engine and watchch sendinding unit. If oil seeps from unit m it is faulty. pick one up at parts store and it should come eith whatever you need to replace old one. pick up a sending sockrt if you can, do bot use an open end wrench ,pliers,or crescent wrench to remove snd install. and do not overtighten, use teflon tape on threads cleanly. good luck



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I need to apologize for my typing. How anyone can read it is beyond me. A stroke wasted my vision a tad. A big tad.
Let me ask without insult. Are you sure they are both wires? There should be no oil coming from there unless it is runnining down the wires from above. Is the oil gauge facrory in dash or after market add on? How do the ends connect to the sending unit? Make sure neither one id plastic tubing.

Posted on May 12, 2009

  • Ned C Cook
    Ned C Cook May 13, 2009

    If connector is a clip than it's a wire. L shaped push on, correct?Ok, forget the sending unit and chk ' how it is routed. Often it will lay on or close enough to the valve cover edge to allow oil from valve cover gssket leakage to collect and run down.. Let's look at that. Good luck. If that is the case, you have a leak to fix on top.Let me know, we'll find it.


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You will find the oil sending unit in any good parts store, and as last resort the dealership


Posted on May 11, 2009


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1 Answer

Where is oil sending unit located on a 2002 honda odyssee 3.5 vtech located

I have done this on a 2003 Odyssey EX. The oil pressure switch is located on the oil pump assembly, which is behind the passenger side front wheel. There are 2 sensors - the oil pressure switch is the furthest one and least accessable. You need to pull off the connector, which is very tight. I used a pair of pliars with a cloth to twist it off. Be carefull not to damage the connector. There are 2 different switches available for the 2003, each with different tread sizes. I used a regular wrench to remove/install the switch, and it stopped the leak that prompted the repair. Another TIP: watch how long your wrench is, because you can catch the power steering pressure switch wiring harness and break the thin wires, leading to a much more expensive repair.... Next time I will disconnect the power steering pressure switch first and pay more attention. Or buy a shorter wrench.... Good luck!After you remove take to Auto part store and match up with a new one.Adeep well socket may also's another site I found on removing.
  1. Locate the oil pressure sending unit on the engine.
  2. Note the anti-theft code and radio presets for the radio.
  3. Disconnect the negative battery cable.
  4. Disconnect the sending unit electrical harness.
  5. Using a pressure switch socket, deep-well socket or wrench, loosen and remove the sending unit from the engine.
To install:
  1. Apply a liquid thread sealant to the sending unit and install the sending unit in the engine and tighten securely.
  2. Attach the electrical connector to the sending unit.
  3. Check the engine oil level and top off as necessary.
  4. Connect the negative battery cable.
  5. Enter the anti-theft code and radio presets for the radio.
  6. Start the engine, allow it to reach operating temperature and check for leaks.
  7. Check for proper sending unit operation.

Aug 12, 2015 | Honda Cars & Trucks

1 Answer

I need to replace the oil sender switch on my 2002 Buick La Sabre

first need to buy oil pressure sending unit 3/8 deep socket remove oil pressure sending unit you need teflon tap sealer for oil sending unit threads.okay to replace oil pressure sending need safe raise support vechicle locate oil pressure sending unit next to the oil filter.disconnect oil pressure sending unit wire connector then use oil pressure sending unit 3/8 socket remove the sending unit.then take new oil pressure sending unit use teflon tape white plumbers tape or use thread sealer apply to the oil pressure sending unit threads then install new oil pressure sending unit and reconnect electrical connector to sending unit.then crank engine check for oil leak if all is good lower vechicle back to ground wait several minutes check engine oil good to roll.

Feb 09, 2013 | 2002 Buick LeSabre

1 Answer


Take the sending unit back, either you truly have high oil pressure and you blow the oil filter or the sending unit is shorting together with power,or the harness has rub through together, either way get another part under warranty and go from there,and be careful how you install the unit

Nov 09, 2012 | Cars & Trucks

1 Answer

Warning buzzer and oil light flash on VW Golf 1.3 Model 1987, oil levels are fine, this happens as soon as I start driving

You should see 2 sensors on the oil filter housing. These are oil pressure sending units. Check the electrical connections and wires first. Make sure everything is good, no corrosion, no cracks or breaks in the insulation and no broken wire strands at the connections. If everything is good then one of those sending units is bad. Hope this helps.

Mar 23, 2012 | Cars & Trucks

2 Answers

My oil pressure gauge (on the top right of the dashboard) randomly shows the oil pressure going down to zero (check gauge light comes on) and then randomly goes back into the normal range. It happens...

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.

Mar 20, 2011 | 2002 Jeep Grand Cherokee

1 Answer

I need to know where the oli sending unit is and how to replace it?


Fig. 1: Location of the oil pressure switch-3.3L and 3.8L engines


Fig. 2: Location of the oil pressure switch-3.0L engine


Fig.: Oil pressure switch (sending unit) schematic

The low oil pressure warning lamp will illuminate when the ignition switch is turned to the ON position without the engine running. The lamp also illuminates if the engine oil pressure drops below a safe oil pressure level. To test the system, perform the following:

  1. Turn the ignition switch to the ON position.
  2. If the lamp does not light, check for a broken or disconnected wire around the engine and oil pressure sending unit switch.
  3. If the wire at the connector checks out OK, pull the connector loose from the switch and, with a jumper wire, ground the connector to the engine.
  4. With the ignition switch turned to the ON position, check the warning lamp. If the lamp still fails to light, check for a burned out lamp or disconnected socket in the instrument cluster.

On the 2.4L engine, the oil pressure switch is located on the side of the engine block facing the firewall. On the 3.0L engine, the oil pressure switch is located on the oil filter adapter housing, next to the starter motor. On the 3.3L and 3.8L engines, the oil pressure switch is located next to the oil filter.
  1. Locate the oil pressure sending unit on the engine.
  2. Disconnect the negative battery cable.
  3. Disconnect the pressure switch electrical harness.
  4. Using a pressure switch socket, deep-well socket or wrench, loosen and remove the pressure switch from the engine.
To install:
  1. Install the pressure switch into the engine and tighten securely.
  2. Attach the electrical connector to the switch.
  3. Connect the negative battery cable.
  4. Start the engine, allow it to reach operating temperature and check for leaks.
  5. Check for proper oil pressure switch operation.

Hope this helps (remember to rate this answerr).

Dec 22, 2010 | 1999 Plymouth Voyager

2 Answers

Need to replace oil pressure sensor/or sending unit(getting low oil pressure idiot light when idleing in drive) 1997 dodge neon dhc 2.0L. I have a new one but cant seem to find where it is located on the...

In my experience with neon's the sending unit is most likely not the problem. I feel that you will find that the oil pressure is actually low and that the oil pump is going out. If you change the sending unit and it doesn't change then you will know for sure. The sending unit is located on the side of the block near the oil filter. It has one wire and simply unscrews and the new one screws back in and re-attach the wire. Hope this helps. Good luck.

Dec 03, 2009 | 1997 Dodge Neon

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Oil pressure guage on a 96 chevy truck

sounds like you still have a wire harness problem for the oil pressure sending unit. if you spliced a new pigtail to the wire harness you may still have a bad connection or there is still a damaged wire farther up in the harness.

Oct 27, 2009 | 1996 Chevrolet K1500

3 Answers

Oil pressure problem

You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil. 
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it. 
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector. 
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL

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