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Should O2 sensors be replaced in pairs? (more) (archive)
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Posted by atd on February 10, 2002 at 21:28:54:

I have a 97 M3..got the O2 sensor fault from my peake reset tool (Pre-cat oxy sensor response time failure, Cylinder 4-6)
Should I replace both Pre-cat sensors at the same time?
thanks Alex

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