Question about 2000 Honda Civic

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I have a 2000 honda civic I need to see what this code means po420

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  • If this is the only code you are getting, for a 2000 Honda Civic, this code indicates you need to replace the Catalytic Converter.

Regards, Tony

Posted on May 19, 2011

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Posted on Jan 02, 2017

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Trouble Code p0420 and p1399


code po420 refers to cat converter system bank1 - efficiency below threshold===causes -- cat converter---wiring---HO2S 2
code p1399 refers to cylinder no 6 misfire===causes --fuel/ ignition---VTEC system---MAP sensor--wiring---mechanical fault.

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I have a 2000 honda civic code po420 came up so what catlacy coverter do I change the one bye the engine or in the back


theres only one catalytic converter. but it should be refering to the oxygen sensors. if your going to change them, you should change all of them, but since i can imagine money is an issue right now in this economy, change the front one, its the main one, and the one towards the rear is the back-up one. hope this helps, goodluck.

May 19, 2011 | 2000 Honda Civic

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Honda civic 2000 problem code PO420


P0420: Calayst system efficiency below threshold (Bank no. 1)
You can clear the code by turning your engine off, locating fuse number 12 in your under hood fuse box (backup, radio 7.5A) and pulling that fuse for about 10 seconds. If the code comes back, it was not a glitch and I would have the code checked out (has to do with you catalytic converter, I believe).
Hope this helps you.

Nov 22, 2009 | 2000 Honda Civic

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I have code PO420


this is a catalytic converter code which may require converter replacement

Sep 27, 2009 | 2001 Honda Civic

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My 2000 honda civic engine light on code p1456


Hey I had the same code and I have a 2000 honda civic lx. My cousin works at honda and drives a '96 honda civic and he has had that code before on his car as well.

First thing he came up with was that the catalytic converter was cracked. We checked mines, and lo and behold, that's what it was.

Look under your hood, and there should be a catalytic converter with a sensor sticking out of it. It is connected to the exhaust manifold and the sensor sticks out of the heat shield. Around the sensor, look for a crack. If there's a crack, that's your problem.

Apr 23, 2009 | 2000 Honda Civic

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CODE RADIO HONDA CIVIC 2000


you need to get the serial number and take that to youre honda dealer they can get you a code, usually free

Sep 30, 2008 | 2000 Honda Civic

1 Answer

Honda civic 2000


check in drivers door jam , glove box there should be a little sticker somewhere there with a 5 didgit code that will be youre code or in with youre owners stuff,once you try putting the wrong code in three times it will show error then you will need to disfconnect the - battery cable to try again, if you fcant find the code you will need to take to dealer and ask them for it they should have it if not you will need the serial number off the radio and they can get it with that

Sep 25, 2008 | 2000 Honda Civic

2 Answers

Honda civic code PO420


Code P0420 Catalyst System Efficiency Below Threshold (Bank #1) Can't really say if driving it that long would cause damage.

Jun 14, 2008 | 2000 Honda Civic

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