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NOx Failure, O2 Sensor , and the Vantage
Posted to Emissions Forum on 12/14/2006 46 Replies

Hi EmF,

A few days ago I repaired a 1993 Pontiac Grand Am 2.3L SOHC Quad Four that had failed it's ASM Smog Test for NOx.

Here are the gas readings from a Test Only Station [1993 Pontiac Grand Am, N/A Infrared] As you can see it barely passed for NOx at 15... Login to read more.

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