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Author of "101 Projects"
Join Date: Jan 1995
Location: Rolling Hills Estates, CA
Posts: 27,056
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Yup, the two oxygen sensors measure the efficiency and proper operation of the catalytic converters. Many times when they throw a code, it's the sensors themselves that have a problem. But in this case, if you hear rattling, I would suspect that the problem lies with the converter and the 02 sensors are giving you an accurate warning.
-Wayne
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