I have a 2000 Forester with 89,000 miles.
It had two oxygen sensors replaced under warranty within the whole- vehicle warranty period.
I have a Check Engine light on again. I own an OBD code reader and it's indicating a malfunctioning catalyst. If this is the case, I am not thrilled as I recently replaced the catalyst on my Land Rover and I know what those things cost!
If it IS the catalyst, are emissions components covered under warranty to 100,000 miles? Again, this is in the USA.