Cannot locate oil sender - 2001 Nissan Frontier Crew Cab

The AWD Equinox has two model selections (LS & LT) and two 2.4L engine options (K2.4L FI DOHC & the K2.4L Flex Fuel DOHC.)

Information on the Equinox engines oil pressure senders location is difficult to find on line so all I can offer in the way of help is to say that It will be on the engine block connected to the ECM (engine Control Module) with a single TN/BK (Tan/Black) wire lead.

The Oil Pressure Sender is a distinct looking unit that is sold by Autozone and they provide pictures of the various makes which should help you identify the units location on your engine block.


Gauge Sender

I'm not familiar with your vehicle. However, an oil pressure sender unit is usually located on the block, below the cylinder head.

it's more often than not a screw - in unit which may have a brass appearance and have 1 or more electrical wires coming from it.

Here is a link which will show you generic images of sender units:
oil pressure sender unit Google Search

They are -usually - just screw-in items. They are not difficult to change.

Here's a further link that may help you:
2005 Chevrolet Impala 3800 oil pressure sender unit Google Search

Location of oil pressure sender unit depends on what engine you have. There should be one wire going to sender, and if it has come off, gauge will read zero. 4.0 inline 6 has sender low on passenger side of engine, above the starter.

The oil pressure sender is a sensor connected to your engine block. It has two wires connected to it and one is directly linked to the oil pressure gauge located on your dashboard. The sender is typically located at the front of your engine block near the fuel filter and close to the intake manifold. Applications vary, so be sure to check your owner's manual to confirm its actual location. You should have easy access to it from the front of the engine block, but you may still need to remove some parts or components to reach and replace it like the fuel filter. You'll need to detach the two wires connected to the outside, unscrew the sender from its housing, clean the gunk out of the threads in the housing, pre-seed the threads of the new sender with a light film of oil, and then screw the new oil pressure sender back into the housing. The final steps include re-attaching the two wires and any removed components like the fuel filter.

Not sure of your engine size so please pick the appropriate diagram:

Coolant temperature and oil pressure senders-4.3L engines

Coolant temperature and oil pressure senders-5.0L and 5.7L engines

Coolant temperature and oil pressure senders-7.4L engines

Coolant temperature and oil pressure senders-6.2L and 6.5L diesel engines

just above oil filter mount.

Removal & Installation

1. Disconnect the negative cable from the battery.
   
2. Raise vehicle on hoist.
   
3. Remove front splash shield.
   
4. Disconnect oil pressure sender connector (4).
   
5. Remove the pressure sender (2).
   

Oil pressure sending unit


To install:

1. Install oil pressure sender.
   
2. Connect oil pressure sender wire.
   
3. Install front splash shield.
   
4. Lower vehicle.
   
5. Connect the negative battery cable.
   

Removal & Installation

1. Disconnect the negative cable from the battery.
2. Raise vehicle on hoist.
3. Remove front splash shield.
4. Disconnect oil pressure sender connector (4).
5. Remove the pressure sender (2).
   

To install:

1. Install oil pressure sender.
2. Connect oil pressure sender wire.
3. Install front splash shield.
4. Lower vehicle.
5. Connect the negative battery cable.

the oil pressure sending unit is usally located in the same side the oil filter is and this is because the oil filter is connected to the oil pump so there should be one little single wire in that area

here is the location