Question about 1991 Saab 900
Did not pass emissions failed for excessive NOx. Failure could also be themostat or O2 sensor. I do not have manuel for the car.
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Posted on Jan 02, 2017
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Please note that while a failed catalytic converter will contribute to high NOx readings, the failure in itself may have been caused by some other upstream performance problem. In all cases, it is crucial to identify the root cause of the problem before blaming the converter.
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