Question about 1987 Volvo 740
Unscrew the Ox sensor and clean the tip with kerosene and dry. If result still negative, replacement is required.
Posted on Oct 09, 2009
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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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