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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Can catalytic converter cause a PO65O code


Pesky PO420 Codes - Eastern Catalytic

www.easterncatalytic.com/education/tech-tips/pesky-p0420-codes/
One of the most annoying is the persistent PO420 diagnostic code (Catalyst System ... not only shows its teeth when the catalytic converter is on the blink, but can also be ... Most, if not all, catalytic converter failures are caused by a problem or ...

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www.obd-codes.com/p0420
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