Car failed smog twice

Tiny
JJONAK
  • MEMBER
  • 1999 PONTIAC SUNFIRE
  • AUTOMATIC
I took my 99 pontiac sunfire in to get it smogged. It failed due to high NO reading during the 15mph test. My mechanic said I needed to replace my cat converter so I did. Took it back today for smog and it failed again for the same reason. What would cause this to happen now?
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Friday, March 11th, 2011 AT 1:28 AM

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Tiny
RASMATAZ
  • MEMBER
Clean out the EGR valve and see what happens
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Friday, March 11th, 2011 AT 1:32 AM

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