2004 Honda Civic po420

2004 HONDA CIVIC
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OSCAR4500
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Engine Performance problem
2004 Honda Civic 4 cyl Two Wheel Drive Automatic

I Have a civic 04 ex what is a po420 code what is that i need more infro on that...
Feb 18, 2009 at 2:24 AM
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RASMATAZ
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Could be a problem with the oxygen sensors, exhaust leak and the catalytic converter.
Feb 18, 2009 at 4:03 AM