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Old

Aug 22, 2007 | 07:48 PM

#1

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Joined: Aug 2007

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From: Kentucky for now

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Codes

I just got a code today on my 2000 TA, P0420 does anyone know what it is?

Old

Aug 23, 2007 | 02:11 AM

#2

Banned

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From: san fernando valley, california

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yup just looked in my repair manual it says catalyst system effciency below threshold, left bank here u go man hope dat helps

Old

Aug 23, 2007 | 12:50 PM

#3

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Joined: Apr 2002

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From: Eastern MA

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Its either a bad 02 sensor or a plugged up cat.

Its in the sticky:
https://ls1tech.com/forums/showthrea...ighlight=P0420

Old

Aug 28, 2007 | 10:49 AM

#4

On The Tree

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From: JOLIET

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It Will Be A Bad Cat 100%

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Oct 2, 2007 | 07:21 PM

#5

Staging Lane

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From: Bay Area

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Its a bad cat on the drivers side.. I just had my replaced for free under the extended warrenty for 120,000 or 10 years from purchase date... the letter should of came in the mail to your address if not call ur local chevorlet dealership and talked to them as it should be replaced for free.

Old

Oct 2, 2007 | 07:26 PM

#6

TECH Senior Member

Joined: Dec 2001

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From: Jacksonville, FL

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Yup, leave the code stored and visit the dealer if you're stock.

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