Question about 2000 Honda Civic

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Honda civic code PO420

I have engine code po420 can i drive car home about 450 miles out of town

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  • charly129 Oct 10, 2008

    i have the code p0420

  • Anonymous Mar 22, 2014

    they said drive car to reset how many miles

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2 Answers

I've been driving my car with this problem for about the last 2 years. I've driven about 400 miles out of town on several occassions and it hasn't been a problem.

Posted on Jul 28, 2008

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

Posted on Jul 14, 2008

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1 Answer

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.

Dec 31, 2013 | 1999 Honda Civic

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Check engine light is on


Go to google & type in ---OBD2 Codes
1998 honda accord PO420 etc

Mar 02, 2013 | Honda Accord Cars & Trucks

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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

1 Answer

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


  • 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

May 19, 2011 | 2000 Honda Civic

5 Answers

Po420 haunting me 03 jetta 1.8t


You're going to have to have the codes read and find out what is setting that light on. After that problem is repaired, the car must indeed complete a drive cycle, not nessacarily 200 miles. This lets the computer run all it's tests and set all its readiness monitors. If you know what the code number is now, post it and I'll tell you the most likely cause, and repair.

Feb 04, 2010 | 1998 Volkswagen Jetta

1 Answer

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

2 Answers

I have code PO420


this is a catalytic converter code which may require converter replacement

Sep 27, 2009 | 2001 Honda Civic

2 Answers

2000 corolla with trouble code po420


If the code has cleared on its own then you need to disconnect the battery and re-connect it. This will clear the codes out of the memory. If you don't want to do this you can go to an auto parts strore and have them hook the little computer up to your car and they can clear out the code as well.

Sep 02, 2009 | 2002 Toyota Camry

1 Answer

I have a 2000 chrysler concorde that the engine light just popped on - the error codes are po302, po420, po340


P0302-cylinder #2 misfire detected
P0420- catalyst efficiency below threshold bank 1
P0340-No cam signal at PCM.
The Cam sensor most likely needs to be replaced first. Clear the codes after that and drive and see what comes back on.

May 29, 2009 | 2000 Chrysler Concorde

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