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Failed on NOX... 200 1984

put guaranteed to pass in tank, and drove to hempstead and back, failed by about 200 ppm on nox, both lo and hi speed. it is egr, timing, or cat. i know it is not egr, because this car has none, and it had a new cat in 96. how do i diagnose a faulty cat? please help, i have 15 days to get it fixed...
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*84 Volvo 240 DL-Mike*-251,000 milez and a Killa System to boot...






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