Question about Buick LeSabre

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P0420 code - LeSabre Buick Cars & Trucks

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  • bodna2 Apr 06, 2009

    I HAVE A 2003 CHRYSLER 300 M SPECIAL 3.5 READING CODE P0420 REPALCED REAR 02 SENSORS AND P.C..V. DROVE CAR FOR A WHILE CODE CAME BACK THIS MORING MILEAGE ON CAR 146000KM

  • Javier Diaz
    Javier Diaz May 17, 2009

    I have a 1997 Nissan p/u with a 2.4L. My customer put 3 new cats and it keeps throwing the same code P0420 cat efficiency and now I got the truck with the same code P0420. I see the O2 sensors are working but the rear is almost switching the same as the front. And one thing I noticed on the scanner is that its running to cold 180F



    help please call me at 623 363-5420 or email me at jdiaz5@cox.net

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In case anyone else comes across this, there's a 90% chance the converter has failed. Check that the rear O2 sensor is working right using an oscilliscope or scan tool. If it's OK then the cat is likely needing replacement. More info at http://p0420.com

Posted on Mar 31, 2009

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My 2005 chevy equinox keeps showing problem code P0420 How do I fix this problem?


0 2 sensor near the catalytic converter or

replace the catalytic converter

The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar.

Read more at: https://www.obd-codes.com/p0420
Copyright OBD-Codes.com

https://www.obd-codes.com/p0420

Feb 03, 2017 | Cars & Trucks

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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

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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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What is wrong when this code shows up p0420 shows up..This is a 2006 nissan sentra


P0420 NISSAN - Catalytic Converter Efficiency Below Threshold Bank 1

The most common cause for the OBDII code P0420 on Nissan vehicles is the three way catalytic converter Bank 1 has reached the end of its useful life.. Since this is a very expensive part you need the code fully diagnosed as some other things like exhaust leaks or poor engine tune can cause it as well

Oct 05, 2012 | 2006 Nissan Sentra 1.8

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.

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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

Fault codes p0420&p1406


catylist efficiency below threshold ( p0420 ). heres a probable fix. go to http://repairpal.com/obd-code-p0420----- this will tell what may be wrong as not to replace parts that are not bad.

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Error codes: P0420 AND P0446


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P0420 & P0430 codes 99 silverado


codes p0420 and p0430 are both post o2 sensors, the ones after the convertor, both sides if replacing

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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.

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