O2 sensors can fall victim to poor fuel quality. The lower the octane, the hotter the fuel burns. Modern fuel loses 1-1.5 points of octane a month. Sooo... your 87 octane fuel, if absolutely fresh when parked, could be in the 70's after 6 months! Too much heat at sensor and bye-bye
Octane Ratings (In the USA, 0-100 points for common pump gas) are a fuels' resistance to ignition in the presence of heat and pressure relative to a baseline combustible such as n-Heptane, which is rated at the Zero Octane point. Octane ratings have no correlation to combustion temperatures produced by a fuel while burning. That is one of the more common fuel myths circulating out there...
While gasoline loses Octane rating points as it ages, its combustion temperatures don't respond by increasing or decreasing linearly to Octane points. It is the chemical makeup of the fuel and its additives that determine its combustion temperature at any given cylinder pressure point. Depending on the fuel base or chemical additive package, combustion temp may be much higher, the same, or much lower... Octane is simply a fuels' resistance to ignition in the presence of heat and pressure. Nothing more. Nothing less.
For instance, an alcohol based fuel (such as methanol, which I consider myself to possess expert knowledge of) is rated at a higher Octane than gasoline, yet its combustion temperatures are much lower while burning, than any gasoline blend on the planet. Toluene is rated at about 114 Octane... guess the range its combustion temp is...?
An oxygen sensor can be destroyed by excessive heat like anything else can for sure, but aging pump gas and/or low Octane rated gas are not a direct causal factor for that.
Hope this helps,