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



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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Posted on Jan 02, 2017

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I have a 2004 Nissan Titan truck that was throwing code po420 bank 1.O2 sensors were changed and check engine light was reset.Is there a drive cycling protocol to reset the computer?If so, what is it?

catalyst efficiency below threshold bank 1 is a PO420. But i would check the oxygen sensor out first that also will cause a check engine light .A cheap one can fail but to check yours take it out and heat the end with a torch with and check it with a voltmeter. I would google that first if your not familiar with that method.Some vehicals take about 30-60 miles before the code will pop back up but with newer vehicals it will pop the code right away.

Dec 02, 2017 | Nissan Cars & Trucks

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

1 Answer

Check engine light is on

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

Mar 02, 2013 | Honda Accord Cars & Trucks

1 Answer

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

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