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I have had bad luck with Bosch 4.2 style sensors. They last a few months
If you have any oil blow-by on start up that will kill them quickly. Which is an air cooled engine trait.
I’ve installed a Rothsport check valve and that has greatly reduced the smoke on cold start. I have not replaced the 4.2 since then so I can’t prove that it will increase the life of the sensor.
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