carbon monoxide

  1. P

    Failed Emission test - 1988 Cherokee Pioneer

    I went to register my jeep today and I failed the emission test. It passed the equipment inspection and the Oxides of Nitrogren (NOX) test. It failed the Hydrocarbons and Carbon Monoxide tests however. The results are as follows: HC: my truck = 3.16 standard = 3.00 CO: my truck...
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