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 Post subject: P0420 code ??? Help
PostPosted: Wed Dec 06, 2017 7:38 pm 
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SLE Member
SLE Member

Joined: Sun Jan 27, 2013 12:51 pm
Posts: 56
Year and Trim: 2000 Lesabre
CEL came on today, scanner says above code,,,car has 195k on it...how do I know IF its the convertor or the 02 sensor ??
Thx


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 Post subject: Re: P0420 code ??? Help
PostPosted: Thu Dec 07, 2017 10:05 am 
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Posts like an L67
Posts like an L67

Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1260
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
if you have a scanner that reads rediness, you can see if the o2 sensor passed its self-diagnostic. if it did, sensor is ok but still could be many causes

look here....http://www.easterncatalytic.com/educati ... 420-codes/

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poverty forces one to do unorthodox things

2000 SSEi
past rides:
1996 SSEi
1992 GTP
1987 Grand Am


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 Post subject: Re: P0420 code ??? Help
PostPosted: Thu Dec 07, 2017 1:41 pm 
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Certified Bonneville Nut
Certified Bonneville Nut
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Joined: Mon May 10, 2010 6:11 pm
Posts: 8709
Location: Chicago, IL
Year and Trim: 2003 SLE
After 195k miles, it's probably the cat.

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"Penelope" - 164k Miles
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 Post subject: Re: P0420 code ??? Help
PostPosted: Tue Dec 12, 2017 12:30 am 
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Joined: Wed Oct 18, 2017 9:26 pm
Posts: 38
Location: Martinsburg, IN
Year and Trim: '03 SLE Silver/Charcoal
I am at 183k and mine is doing this as well. I use Torque Pro to log the data and check readiness. I can clear it and it comes back... Cat is not clogged so I am running it as it is for now as we do not smog check and if they do they just look for codes... delete in the parking lot and pray it don't flag when tested when we did have testing here. I will eventually get it replaced when it warms up. and I replace the exhaust system...

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2002 SLE "Frankenbonnie" 02 engine, 04 transmission, and a 03 PCM to make everything talk. Sadly I know longer own
1993 Suburban Zombie Apocalypse Assault Vehicle (GMC Edition)
2003 Yukon Black/Charcoal cloth 4x4 POW/MIA
2003 SLE Silver/Charcoal (New Acquisition)


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