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Service engine soon code P0420

This is a discussion on Service engine soon code P0420 within the General Help forums, part of the LSx Technical Help Section category; Just picked up an OBD2 reader from Harbor Freight. Ran the scan and came back with code P0420 (Catalyist system ...

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    2002 Trans-Am WS-6

    Service engine soon code P0420

    Just picked up an OBD2 reader from Harbor Freight. Ran the scan and came back with code P0420 (Catalyist system efficiency below threshold, left bank) Any ideas what this could be? I cleaned out the PCV valve with throttle body cleaner several days ago and wondering if it's possible that this may be the cause. When they say "left bank" is that from the view inside or standing in front of the vehicle.

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    King 0f n00bz shady milkman's Avatar
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    blacker than wesleysnipes
    98' trans am

    P0420 is for bank one ..... this code is basically saying your cat is junk....scrap it and run no cats.or buy a new one

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    Moderator Cutlass's Avatar
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    1999 Formula WS6 M6-sold
    2001 Silverado Z71

    There is a GM special policy that extended the cat converter warranty to 10 years/120,000 miles.
    Refer to this thread for more info.

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    Member 98Hardtop's Avatar
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    1998 Camaro Z/28

    Yep, it relates to a bad cat.

    09 Vulcan 900 custom.
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    1998 Z/28 Hardtop A4 | Y2K wheels | SLP Lid | Magnaflow catback |cutout | Hotchkis LCA'S/PHB | BMR TA and D/S Loop| Tuned by Frost....300rwhp/308rwtq

    97 Cobra- bolt ons | full exhaust| 4.30's| suspension | SCT tune- sold!

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    Member Sas's Avatar
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    You better hurry on the replacement if you go the warrenty route. It expires November 9th or 12th or something they told me.

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