Question about 2001 Honda Odyssey

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HONDA ODYYSEY 99 - TROUBLE CODE O1456 , AND P0420

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1456 is a fuel temp sensory circuit 420 is a catalyst below threshold, check fuel cap. or could be the two way vavle on your evaporator stuck

Posted on Sep 12, 2009

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What means catalyst Efficiency below normal


      Got it scanned and it's P0420: Catalyst efficiency below thresholdbank 1. They said it could be a bad catalytic converter or oxygen sensor. I borrowed a scanner and tried to measure the oxygen sensor readings over time.Sep 8, 2011

      civic - Check Engine code P0420 Catalyst efficiency below ...

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    P0420 Error Code: Catalyst System Efficiency Below ...

    www.obd-codes.com/p0420
    P0420 OBD-II Trouble Code. Technical Description. Catalyst System Efficiency Below Threshold (Bank 1). What does that mean? This diagnostic trouble code ...

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Jan 26, 2016 | Cars & Trucks

2 Answers

I have a PO 420 code on 07 accord. Does that mean my catalytic converter is bad?


Usually does. But I check the O2 sensors first. Ohm check them and the wires. Your cats are expensive, I don't won't to misdiagnose.

Feb 07, 2015 | 2007 Honda Accord Sedan

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

TROUBLE CODE P0420


P0420 isnt a misfiring code; this code P0420 is refer at Catalyst System Efficiency Below Threshold (Bank 1).

Feel free to contact us if you need additional details to volve it clicking the link.

Oct 24, 2011 | 2002 Volvo S60

2 Answers

P0420 error code honda odyssey


You don't necessarily need a new converter. I had this code on my 2006 Odyssey at around 150,000 miles for both the front and rear converter and only needed new downstream O2 sensors ($40 for the back, $60 for the front). This is why my car never sees the inside of a dealership shop, they're happy to replace your converter for >$1000 without even looking at the problem. A little troubleshooting goes a long way here. I grabbed an engine code reader from the local auto parts store and read the O2 sensors with the engine running and noticed the voltages on them were erratic, and they shouldn't be. Mine were reading ~ 0.8 volts, then would jump down to < 0.1 volts for a couple readings, then back up to 0.8. The downstream sensor readings should be fairly stable.

Apr 19, 2010 | 2000 Honda Civic

2 Answers

P0401,P 0420, CODE IN HONDA ODYSEY


P0401- Bad EGR valve
P0420- Most likely cause is a bad O2 sensor(s) at the catalytic converter

Sep 08, 2009 | 2001 Honda Accord

2 Answers

Trouble shooting P0420 code, bank 1, OBD II for 2000'?


misfiring can cause a P0420 code.
I would recommend a set of honda plug wires and plugs if the P0420 code returns.
I have used bolt in aftermarket bolt in catalytic converters but don't remember the brand name they fit ok and i have had 1 or 2 return with a P0420 code out of about 20. I have never replaced the oxygen sensor on a civic like yours.
I always fix the misfire problems, reset the computer, and have the customer drive it and see if the code p0420 returns. 50% don't have the P420 code return. drive it and see what happens and go from there.

Jan 06, 2009 | 2000 Honda Civic

2 Answers

'99 Accord: P0420 and Sometimes Engine Hesitation & Rough Idling


You Definatelly got some Bad Fuel. Get a can of B-12 Chemtool from any Auto Parts Store or Wal-Mart and Pour it in the Gas Tank then Let it Run for a While. Should help Dramatically! Let me know!

Jan 02, 2009 | 1999 Honda Accord

2 Answers

'99 Accord: P0420 and Sometimes Engine Hesitation & Rough Idling


First thing I would do is clean the throttle body if nothing changes check your mass air sensor if still nothing. change (or clean) your oxygen sensors can normally be found on the exhaust manifolds. also it couldn't hurt to give it an oil change and use a fuel additive to get rid off all the nasty build up in the engine I use BG 44K

That's all the information I have good luck!

Jan 02, 2009 | 2001 Toyota Corolla

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