Failed emissions.

2000 HYUNDAI SONATA
118,000 MILES
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SB5676
  • MEMBER
  • 1 POST
NOx is 3.5, limit is 1.5. Gave it tune up, changed oil, and put a new catylitic converter on it and it's still failing. After doing all this, it solved the check engine light problem but, after a month, the light is back on. Any help would be greatly appreciated.
Nov 23, 2011 at 3:26 AM
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JACOBANDNICKOLAS
  • ✓ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Can you tell me the exact trouble codes that are stored in the computer?
Nov 23, 2011 at 3:28 AM
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