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Re: 2003 OLDS ALERO 2.2L HIGH NOX
Posted to Emissions Forum on 9/17/2009 39 Replies

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If you mean this discrepancy, it confirms my diagnosis:

">co2 14.2, hc 63, co .65, nox 2141, o2 1.7, lambda 1.055, af 15.51. I

Precat CO of .65% indicates lambda 1 yet your O2 indicates very lean... Login to read more.

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