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There are specific codes that detail what is wrong with the O2 sensors. Short, aged, etc. I'd be very surprised that a Durametric couldn't be very specific as a generic code reader will pick up the specific fault and the specific O2 sensor.
For example the P0159 gives you a post-cat bank-2 aged description.
Usually, it is the pre-cats that fail first at around 60-70k miles.
Good luck, they can be difficult to get off.
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