420 catalyst system low efficiency - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat
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2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-20-2009, 10:33 AM   #11
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This is fantastic information.
Until now, it thought an O2 sensor was just a "replace and see if it gets better" type of an item. You'll save me a few dollars, and I certainly need that!
Thanks for this information.
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