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If you have one side unmeasured and that side has an issue and goes lean, you may not know until you burn a hole in the piston. An expensive repair with 4 wheels on the ground. A little more concerning at 9000 ft.
I have gone through 2 WB02 sensors on my 930. I think the heat is killing mine, but they do not seem very good long term to me. And mine were both Bosch. Id want one on each side just so if one goes you still have something until you can replace it.
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1988 930 Venetian Blue
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