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Re: 1991 Buick Century 3.3L NOX Failure
Posted to Emissions Forum on 1/24/2007 23 Replies

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Lambda calculates at 1.011 - not much lean, but a little bit. Notice that the Post CAT oxidation numbers are very good - which also supports the 'slightly lean' diagnosis.

The CAT cannot reduce the ... Login to read more.

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