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International Automotive Technicians Network
Re: GM Nox/Negative Backpressure EGR Smog Failure
Posted to Technical Discussion Forum on 11/8/1999

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Hey Bill, if this car failed for CO, and the O2 sensor is swinging, then the O2 sensor is shifted. Most of the time, an engine that is running rich will not produce Nox. Now this one is not producing ... Login to read more.