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Advise: Replace in pairs both pre-cats (archive)
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Posted by LuxoM3 on February 11, 2002 at 01:01:18:

In Reply to: Should O2 sensors be replaced in pairs? (more) posted by atd on February 10, 2002 at 21:28:54:

As they tend to go out within 10k of each other...so as to also save yourself some labor cash.

For some odd reason when both my precat O2s went out, the post cat ones are still fine. Go figure.

-LuxoM3

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