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2001 Hyundai Accent Smog test failed

Tiny
ACKPACKET
  • MEMBER
  • 2001 HYUNDAI ACCENT
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 83,000 MILES
I have a 2001 hyundai accent with 83,000 miles. Just took it in for smog and it didn't pass. The NOX was in the high 600's, around 670-680, for both 15mph and 25mph. It failed the NOx at 15mph, and the CO, while passing, is far above average. Sparkplugs are over a year old.
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Friday, September 12th, 2008 AT 9:43 PM

1 Reply

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
NOX failures are usually EGR-related, since the EGR system is primarily responsible for reducing oxides of nitrogen. But NOX emissions can also be caused by a bad three-way converter or a computer control system that remains in open loop.

High CO On newer vehicles with electronic carburetors or fuel injection, the system may not be going into closed loop because of a bad coolant or oxygen sensor. Rich mixture
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Saturday, September 13th, 2008 AT 6:13 AM

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