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P0420

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Jun 4, 2006

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gillio215 is an unknown quantity at this point

P0420

can anyone help. i got a 2001 civic ex stock header test pipe resonator with two 02 censors were OEM would be. apex cat. back 2.5 pipe front to back. now i just got this code after little more than a week of putting this in. the code is P0420 i now what the code is and i got rid of it with a scan tool but will it come back what can i do. one more thing it came on near low gas light turning on.

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01, 04, 1999, 2000, 2001, 2003, civic, code, cost, honda, lx, obd, p0420, po420, si

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