Your car is probably still worth around $4000 to $5000 depending on condition and kilometres. The catch is that you won’t be offered that much if you use the car as a trade-in, and the value I’ve quoted would be to sell the car privately, not back to a car dealer. A lack of demand for good used cars is keeping values a little higher (a lot higher in some cases) than they might have been, so even though your car is still worth decent money, you’ll pay a bit extra for whatever you replace it with.

As far as lifespan goes, that has a lot more to do with maintenance than any other factor. If your car has been serviced by the book, there’s every chance it could last for 200,000 to 250,000km and perhaps even more. But I’ve also seen neglected cars die incredibly young.

It could be a fault with the computer, but I would have it investigated rather write it off as a computer glitch. You could have a problem with the cooling system, so I would have a mechanic investigate it.

It could be due to bad fuel. Run it out as best you can, or drain the tank, and refill with fresh fuel from another servo, preferably one that sells a lot of fuel so you can be confident the fuel is fresh.

If it still does it then look for other causes, such as fuel filter, fuel pump, air filter, throttle body, spark plugs.