1998 HONDA CIVIC P0420 CODE

  • Tiny
  • ajgary
  • 1998 Honda Civic
  • 1.6L
  • 4 CYL
  • manual
  • 190,000 miles

My car is running a P0420 code. My exhaust manifold clearly has a crack between the manifold gasket and the 1st O2 sensor. Is it possible that the p0420 code was caused by the crack, or is my catalytic converter definitely shot?

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Thursday, June 12th, 2014 AT 10:48 AM

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  • Tiny
  • Ty Anderson
  • Expert
  • 694 posts

This code doesn't always mean the cat is bad. A crack in your exhaust manifold can cause the exhaust concentration to dilute causing this code or in other words the exhaust coming out of the engine is not being accurately measured by the sensors triggering this code.
However, there still could be an issue after repairing or replacing the exhaust manifold whether the sensors themselves or the catalyst.

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Thursday, June 12th, 2014 AT 11:15 AM

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