Here's why it's unlikely to be just the sending unit, and what's more likely:
* Low Oil Pressure: This is the most serious possibility. Even if the oil level appears correct on the dipstick, low oil pressure means the pump isn't circulating enough oil to lubricate the engine properly. This can lead to catastrophic engine damage if not addressed immediately.
* Failing Oil Pump: A failing oil pump is a common cause of low oil pressure.
* Clogged Oil Filter or Pickup Tube: Restricted oil flow due to a clogged filter or pickup tube can also cause low pressure.
* Worn Engine Bearings: Worn bearings can allow oil to leak past them, reducing the pressure in the system.
Where the Oil Pressure Sending Unit is Located:
The location varies slightly depending on the engine in your Durango (4.7L or 5.7L). Generally, it's on the engine block near the oil filter. You'll likely need to consult a repair manual or online diagrams specific to your Durango's engine to pinpoint its exact location.
What you should do:
1. Do NOT drive the vehicle until this is investigated. Continuing to drive with a consistently illuminated oil light risks severe engine damage.
2. Check the oil level again: Use a dipstick to verify the oil level is actually within the normal range.
3. Check the oil pressure: You can use an oil pressure gauge to directly measure the oil pressure. This is the most reliable way to determine if you have a genuine oil pressure problem. This requires some mechanical skill or the help of a mechanic.
4. If the oil pressure is low, stop driving immediately. Tow the vehicle to a mechanic to diagnose and repair the problem. Ignoring low oil pressure will likely result in a costly engine rebuild or replacement.
While a faulty sending unit is a possibility, the symptoms you describe point towards a more serious mechanical issue. Get it checked out by a professional ASAP.
