1989 Honda Civic

100,000 MILES • 4 CYL • FWD • MANUAL
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COMPACT 19
  • MEMBER
  • 1 POST
my car faild smog because of high hc and o2 why?
Apr 12, 2009 at 8:30 AM
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KHLOW2008
  • ✓Experienced Mechanic
  • 41,812 POSTS
Hi Compact 19,

There are many reasons for high HC and O2.

If any cylinder is misfiring, it would happen.

Is yours a carb or injected model?
Apr 19, 2009 at 2:49 AM
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