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 Post subject: P0420 wont go away!
PostPosted: Fri Aug 17, 2018 4:31 pm 
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SLE Member
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Joined: Fri Jan 30, 2015 12:21 am
Posts: 79
Year and Trim: 2001 SSEi
2001 SSEi - 84,000 miles

74000 miles Replaced rear O2 sensor
84000 - Replaced Catalytic Converter
84000 - replaced upper O2 sensor

only use sunoco 93 gas(maybe a 92 here and there)
(occasionally use a Lucas bottle/ maybe 1x a year, car ave. 5000mi per year)

P00420 would go off maybe every 1500 miles or so
now, every 120 miles now she puts out the P0420 code

symptoms (only because im really looking due to light)
when under load (climbing a hill) and if RPMs are around 1200 she sounds like shes struggling, like i have to give it a lot of gas, soon as i press on gas she goes
gas mileage is about 15.8 in town

will update if i see more

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 Post subject: Re: P0420 wont go away!
PostPosted: Fri Aug 17, 2018 7:56 pm 
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Posts like an L67
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Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1588
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
some info for you in between code resets

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

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

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 Post subject: Re: P0420 wont go away!
PostPosted: Sat Aug 18, 2018 12:51 am 
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Joined: Mon May 19, 2008 6:04 pm
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Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
What cat did you put in?

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 Post subject: Re: P0420 wont go away!
PostPosted: Sat Aug 18, 2018 12:27 pm 
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Joined: Fri Jan 30, 2015 12:21 am
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Year and Trim: 2001 SSEi
I don't know, I paid to have someone do it and they ordered the part.
I took it to my regular mechanic to have things assessed.
He said looks like an aftermarket "performance" cat was used. The code is most likely due to the cat.
He suggested eiter remove this one and put on a OEM replacement, or buy a tuner and ignore the P0420 code. (as well as enjoy other benefits of tuner)

He said the current cat is not harming the car.

feedback?

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 Post subject: Re: P0420 wont go away!
PostPosted: Sat Aug 18, 2018 1:28 pm 
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Posts like an L67
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Joined: Sun Aug 22, 2010 11:11 pm
Posts: 1588
Location: Ontario, Canada
Year and Trim: 2000 Bonniville SSEi L67
what?, the guy who installed it doesnt know what he installed - call him and get the order reciept/invoice. you need a 50 state legal cat or the cali/Canadian one to avoid issues

no I dont believe that any harm will be done , but, you're not going to pass emissions with the code

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2000 SSEi
past rides:
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1987 Grand Am


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 Post subject: Re: P0420 wont go away!
PostPosted: Sun Aug 19, 2018 11:23 am 
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Joined: Mon May 19, 2008 10:30 pm
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Location: Grand Rapids, Michigan
Year and Trim: 2014 Cadillac XTS Vsport.
If necessary, you could go the route of an emulator.
https://zzperformance.com/3800/o2-emulator

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 Post subject: Re: P0420 wont go away!
PostPosted: Mon Aug 20, 2018 10:58 am 
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Location: Chicago, IL
Year and Trim: 2003 SLE
Since it struggles up hills, it makes me think you have some kind of ignition system issue. Is there any other indication of troubles? Does it feel good when you're WOT?

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 Post subject: Re: P0420 wont go away!
PostPosted: Mon Aug 20, 2018 11:06 am 
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Joined: Mon May 19, 2008 6:04 pm
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Location: Browerville, MN
Year and Trim: 2004 GXP - plus a handful of other Bonnevilles
You need a name brand Heavy Metal catalysis, he probably put in a cheap Chinese piece of junk and charged you for a good one.

I recommend the Magnaflow 99306HM (around $100 online), I install them on all my project cars, never had them throw a code.

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 Post subject: Re: P0420 wont go away!
PostPosted: Mon Aug 20, 2018 11:43 am 
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Joined: Fri Jan 30, 2015 12:21 am
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Year and Trim: 2001 SSEi
Thanks for the recommendation.

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 Post subject: Re: P0420 wont go away!
PostPosted: Wed Aug 22, 2018 12:30 am 
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Location: Cincinnati OH
Year and Trim: 03SSEI, 00SSEI, 92SE(sold), 93SSE/SC, 87GTA, 01TA
nos4blood70 wrote:
Since it struggles up hills, it makes me think you have some kind of ignition system issue. Is there any other indication of troubles? Does it feel good when you're WOT?


I have had ignition problems cause a P0420 before.
With your mileage, if your plug wires are original you may want to consider changing them and also check plug gaps.


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 Post subject: Re: P0420 wont go away!
PostPosted: Wed Aug 22, 2018 7:28 am 
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Joined: Fri Jan 30, 2015 12:21 am
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Year and Trim: 2001 SSEi
at 60000miles i had new plugs wires done

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