Possible Causes:
* Low Oil Level: This is the most common and hopefully the least damaging cause. Check your oil level immediately using the dipstick. If it's low, you need an oil change and potentially further investigation to determine *why* the oil level dropped so significantly. A leaking seal, cracked engine block, or other serious issue could be responsible for the low oil.
* Oil Pump Failure: The oil pump is responsible for circulating oil throughout the engine. Failure of the pump itself (mechanical failure or lack of lubrication to the pump) means no oil is being delivered, leading to immediate engine damage. This is a major repair.
* Clogged Oil Filter: A severely clogged oil filter can restrict oil flow, leading to low pressure. While less likely to cause an immediate shutdown than a pump failure, it's still a serious problem.
* Worn Engine Bearings: Worn bearings in the engine increase friction and reduce oil pressure. This is a serious issue that will require a significant engine rebuild or replacement.
* Leaking Oil Cooler: A leak in the oil cooler can cause a rapid loss of oil pressure.
* Faulty Oil Pressure Sensor: While less likely to cause a complete shutdown (the light might come on and stay on, but the engine could still run), a faulty sensor can give a false low-oil-pressure reading. However, given the engine shutdown, this is less probable than the other causes.
What to Do:
1. Call a tow truck: Do not attempt to start the Navigator. Tow it to a qualified mechanic or dealership.
2. Don't add oil before getting it towed: Adding oil to an engine with a possible internal failure is not advised, and may be a waste of resources.
3. Describe the situation to the tow truck driver and the mechanic: Clearly explain the circumstances – the low oil pressure light and the engine shutting off. This information helps them diagnose the problem more effectively.
Possible Costs:
Repair costs will vary greatly depending on the cause. A low oil level might only require an oil change. However, oil pump failure, bearing wear, or a cracked engine block can lead to extremely expensive repairs or even a need for engine replacement.
In short, this is a serious situation requiring professional attention. Ignoring it will likely lead to extensive and costly engine damage.
