Question about 2000 Honda Civic

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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

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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.

Posted on May 19, 2011

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Why doesn't this 2000 Honda civic lx turn over when everything else works inside the car?


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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

2 Answers

Engine code p0420


The P0420 code is set when the oxygen sensor after the catalytic converter gives a reading the same or very close to the reading of the oxygen sensor(s) before the catalytic converter.

There are usually three possible causes...
The front oxygen sensor (before the cat) is giving an incorrect reading.
The rear oxygen sensor (after the cat) is giving an incorrect reading.
The catalytic converter is not working properly.

Since you recently replaced the cat, the logic points to the sensors, but it could be the cat again. Aftermarket converters are usually smaller than OEM and don't last as long.

For a more thorough description of the code and troubleshooting visit
http://www.obd-codes.com/p0420

Our Subaru encountered this issue several years ago under warranty. The first time the dealer replaced the front oxygen sensor. This was the cheapest repair and since it was an intermittent problem I am sure they hoped to delay the issue until the warranty was up. The second time they replaced the catalytic converter and we haven't had any more issues.

Jan 08, 2010 | 2000 Honda Civic

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

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

3 Answers

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

1 Answer

The code PO420 came on for my 2000 Toyota Camray ......


Catalyst Effeciancy below threshold (Bank 1) is the code meaning. Check or replace the oxygen sensors. Some cars have 2 .One is on the front of the cat. the other is the on the back. Check the back sensor . Other possible causes are leaking or damaged exhaust manifold, bad coolant temp sensor.If toyota did not replace both . replace the one on the back of the Caty.

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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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