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2001 Dodge Caravan High NOx Emission test Failed

Tiny
HUTTPH
  • MEMBER
  • 2001 DODGE CARAVAN
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 98,000 MILES
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
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Friday, August 8th, 2008 AT 11:50 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Recheck the EGR system in and out. Its purpose is to reduce oxides of nitrogen Nox
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Friday, August 8th, 2008 AT 12:51 PM
Tiny
HUTTPH
  • MEMBER
  • 2 POSTS
Thanks for the information. Replaced the EGR Valve and passed E test.
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Wednesday, August 13th, 2008 AT 7:47 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
You're welcome next time you come donate a little it helps the website operating to assist people like you-
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Wednesday, August 13th, 2008 AT 8:42 PM

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