Of course Bosch has a vested interest
in periodic refreshes of the O2 sensors rather than waiting till they CEL.
Any independent testing done that verifies this notion of a 60k life cycle? Or that the pre-cat ones fail first? Or that they should be replaced as pairs (both pre's, for example)?
After all, replacing all 4 will buy more than 200 gals of gas at dealer rates.
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