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Have a 2002 honda accord it thru a code p0420 says catalyst efficiancy below threshold. what is that and how do i fix problem

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Essential it means the catalytic converter isn't working as it should. The only way to fix it is replacing the converter. I suggest replacing it with an oem part. I haven't had much luck with aftermarket converters, the code always returns in a few months. Oem converters can be a bit pricey because of the precious metals inside so prepare yourself for some sticker shock. The good thing is that it won't affect the drive ability of the car, so if need be you can live with it while you save.
Be sure to address any other codes you may have in the computer before replacing the converter as some may cause the converter to go bad again.

Posted on Apr 17, 2009

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Posted on Jan 02, 2017

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2 Answers

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 ...

      mechanics.stackexchange.com/.../check-engine-code-p0420-catalyst-efficie...
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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 ...

    P0420 Code Fix How Its Done Catalyst Efficiency Below ...

    ? 4:25
    https://www.youtube.com/watch?v=-c8090n1Ihs
    Jun 20, 2014 - Uploaded by ACE AUTOS UK
    Here is a tutorial on P0420 code fix catalyst efficiency below threshold How To Diagnose a p0420 code ...

Jan 26, 2016 | Cars & Trucks

1 Answer

I have an 02 accord that has the check engine light on. Its got 145000 miles on it. I got it scanned. The codes were p1259 vtec system circuit fault bank 1, p0420 catalyst system efficiency below...


Fix the P1259 code first. Are you using the recommended oil viscosity? If not, change that immediately. Also, check the screen in the Vtec solenoid for sludge buildup. If the variable valve timing isn't working properly, it can cause the P0420. If not fixed soon, that can destroy your cataltytic converter. The P1457 code is less important.

http://ricksfreeautorepairadvice.com/motor-oil-viscosity-warning/

Jul 19, 2017 | 2002 Honda Accord

1 Answer

What do these codes mean ? po430 po420 po306 for mercury cougar 1999


P0430 code is(catalyst efficiency below threshold on bank 2)
P0420 code is((catalyst efficiency below threshold on bank 1)
P0306 code is(cylinder 6 misfire detected)

Dec 13, 2011 | 1999 Mercury Cougar

1 Answer

2002 vw jetta 2.0 code P0420


The error code definition reads:

"Catalyst Efficiency Below Threshold Bank 1"





It's possible it might be the oxygen sensor, but it's more than likely the catalytic converter. This is a relatively common code for VW's.

You can google "p0420" and see the posts...

Jan 24, 2011 | 2002 Volkswagen Jetta TDI

3 Answers

I had my car inspected and received P0420 code? what does it mean?


P0420 Error Code: Catalyst System Efficiency Below Threshold (Bank 1) Repair information for the OBD-II trouble code P0420 - Catalyst System Efficiency Below Threshold (Bank 1)
www.obd-codes.com/p0420

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1 Answer

Code PO42O and PO43O ? Anyone know what they


The meaning of: P0420 Catalyst System Efficiency Below Threshold on Bank 1 P0430 Catalyst System Efficiency Below Threshold on Bank 2

Basically the Oxygen sensors ( one before and one after the catalytic converter ) have abnormal readings from the exhaust. Further diagnosing will need to be done by a mechanic to find the source of the problem. The possibilities could be the O2 sensors themselves, a leak in the exhaust manifold, a bad catalytic converter, and etc.

Nov 14, 2009 | 2002 Toyota RAV4

2 Answers

Check engine light on. P0325, P0420 2000 Subaru


CODE PO420 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD BANK I * CODE PO325 KNOCK SENSOR NO.1 CIRCUIT MALFUNCTION BANK NO.1 OR SINGLE SENSOR

Nov 13, 2009 | 2000 Subaru Outback

2 Answers

Need to know whatDTC's P0420 and P0432 mean for my 2002/3 Jeep Grand Cherokee Laredo 4.7 ltr V8 Thanks Colin


420 is catalist below threshold bank one.
432 is catalist below threshold bank two.

Oct 20, 2009 | 2002 Jeep Grand Cherokee

1 Answer

'02 civic engine code P0420. What does this mean?


it means your 02 sensor pre cat is not working or the cat is no longer any good start with the 02 sen its easy to do and cheaper than the cat

Feb 19, 2009 | 2002 Honda Civic

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