2000 Honda Civic Exhaust Manifold

2000 HONDA CIVIC
Avatar
LX2000
  • MEMBER
  • 1 POST
Engine Performance problem
2000 Honda Civic 4 cyl Front Wheel Drive Automatic
----------------------------------------------------------------
I have a 2000 Honda Civic Lx, my stock exhaust manifold was craked and so I replaced it with headers, and bought a MagnaFlow OBD 2 Cat to move down to the bottom, to make space for the headers. Although my sensors are connected my check engine light comes on. I have already disconnected the battery for 15 sec and connected back on so that it turns off, but after a couple miles of driving it, the light comes back on. I have also done the testing with the computer and got a P0420 bank 1 code (catalyst system efficiency below threshold) What does the code mean and what can I do to fix the problem. If you can please help me! Thanx.
Apr 11, 2008 at 12:41 AM
Advertisement
Avatar
BRUCE HUNT
  • ASE Certified Mechanic
  • 3,754 POSTS
  • ASE Certified Mechanic
its a Civic not a high performance sports car. The computer obviously does not like the output from the O2 sensor and since we are not talking stock here i would talk to the manufacturer of your headers for answers.
Apr 11, 2008 at 10:56 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.