1991 Ninety-eight oldsmobile sedan Car passed emission 25/25 test but fail two parts under 50/15 test co%1.68 allowed 0.63 fail. NQ ppm 891 allowed 853 failed. What is needed to pass emission?
You mean NO or NoX when you say NQ? That's the job of EGR. ....CO, carbon monoxide-- You might need a new catalytic convertor.
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