2001 Dodge Caravan High NOx Emission test Failed

2001 DODGE CARAVAN
98,000 MILES • 6 CYL • 2WD • AUTOMATIC
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HUTTPH
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Had my car in for emission test a failed High NOx on driving test 1147 ppm . Replace muffler, fuel filter, changed oil, added fuel conditioner, new spark plugs, tested EGR valve with vacuum gauge, and no codes on dash. 2nd test results 650 ppm failed. What should I check next. Thanks
Aug 8, 2008 at 11:50 AM
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RASMATAZ
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Recheck the EGR system in and out. Its purpose is to reduce oxides of nitrogen Nox
Aug 8, 2008 at 12:51 PM
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HUTTPH
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[quote:0fbb57492f="rasmataz"]Recheck the EGR system in and out. Its purpose is to reduce oxides of nitrogen Nox[/quote:0fbb57492f] Thanks for the information. Replaced the EGR Valve and passed E test.
Aug 13, 2008 at 7:47 PM
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RASMATAZ
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  • ASE Certified Mechanic
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Aug 13, 2008 at 8:42 PM
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