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What's a km????? :)

That's roughly 100,000 miles and that's a fair amount of mileage. It is possible the sensor is faulty. Also possible the cat is clogged.

If it's running fine I'd try the sensor. Although you don't really need to replace them if it is running ok and the light doesn't bother you too much. It's just an emissions thing, it doesn't effect the truck in any other way. Now, if the truck starts running poorly it could be a clogged cat.
I'd guess a new downstream sensor is ~$50 to $100.

So can u tell if a o2 sensor is hooped or u just have to change it?
 
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