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emissions test for 1988 Volvo 740GLE 700 1988

My 1988 Volvo 740GLE failed the emission test for NOx (standard: 3; test reading: 4.45). It passed the emission test for HC and CO.

Any suggestions for correcting this problem other than purchasing a new catalytic converter. Similar to the suggestion for 240 models, can a hose be plugged in 740's to prevent the NOx problem?






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