2000 Honda Civic Exhaust Manifold

2000 HONDA CIVIC
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LX2000
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Engine Performance problem
2000 Honda Civic 4 cyl Front Wheel Drive Automatic
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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
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BRUCE HUNT
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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