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I think Bosch has crappy oxygen sensors, or a bad batch. I have replace 1 sensor 3 times. The sensor after the cat on the passenger side. The other 3 are the originals on my 1997.
Our smog inspection is every 2 years. Every 2 years I have to replace the same sensor that was replace 2 years before.
In March it is time for a smog inspection again. And again I am getting a check engine light because of that same sensor.
There are a lot of good theories in this thread about sensors going bad. In my case I do not see how the theories would apply.
The shop foreman has been a friend for 8 years and every 2 years at smog time we go over this issue while my car is hooked up to the PST2/PIWIS. He checks my car before I go on the smog machine. If that sensor is acting up again then it is replaced and then I go on the machine and pass.
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