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2007 Accord - P0420 Code #5271174 11/18/19 06:52 PM
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maverickfhs Offline OP
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My occasionally driven 2007 accord with AT and ~154K miles - yesterday filled up the gas tank and after an hour or so drive, randomly started to throw up CEL.

28-30 or mpg are normal, through manual calculation and no performance issues.

Scanned it today and it was P0420 code, should I add techron and give it a try?

Or any other inputs and advise? Thank you thumbsup


2006 Civic EX 209K/AT
2006 Acura TSX 199K/AT
2007 Accord VP 154K/AT
Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271181 11/18/19 07:00 PM
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Direct_Rejection Offline
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Originally Posted by maverickfhs
My occasionally driven 2007 accord with AT and ~154K miles - yesterday filled up the gas tank and after an hour or so drive, randomly started to throw up CEL.

28-30 or mpg are normal, through manual calculation and no performance issues.

Scanned it today and it was P0420 code, should I add techron and give it a try?

Or any other inputs and advise? Thank you thumbsup


Cataclean.
Just before your next smog check.


Lexus UX 250h F-Sport
Pennzoil Hybrid 0W16

Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271183 11/18/19 07:02 PM
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maverickfhs Offline OP
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They showed me Cataclean today on AZ and thought it's a snake oil?

Can I drive it as-is and won't do any major harm? Don't drive it everyday.


2006 Civic EX 209K/AT
2006 Acura TSX 199K/AT
2007 Accord VP 154K/AT
Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271192 11/18/19 07:08 PM
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spasm3 Online Happy
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Cataclean is mostly zylene, acetone, and Isopropyl alcohol.

http://weblink.carquest.com/msds/CCN/CCN%20120007.pd

Occasionally driven and short tripped? I'm thinking some berryman b-12, a good 1 hr drive, and maybe a few italian tuneup type accelerations after the hour drive.

Last edited by spasm3; 11/18/19 07:11 PM.

13 elantra 78k 5w30 synpwr
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Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271197 11/18/19 07:13 PM
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Originally Posted by maverickfhs
They showed me Cataclean today on AZ and thought it's a snake oil?

Can I drive it as-is and won't do any major harm? Don't drive it everyday.



I have pulled that P0420 code before.

Catalyst below threshold.

It does not seem to hurt anything other than your pocketbook when needing to pass a smog check.


Lexus UX 250h F-Sport
Pennzoil Hybrid 0W16

Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271203 11/18/19 07:20 PM
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Either the cat is bad, or the downstream oxygen sensor is too dirty to work well any more.
On the CataClean thing, I didn't know that existed. Nice idea for a product. Might work, who knows?
Does seem like the zylene, acetone, and alcohol would just oxidize in the combustion chamber, leaving little to no solvent to cleanse the cat.


2019 VW Tiguan S 4Motion, Pennzoil Platinum 0w-20, VW Mann oil filter
Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271233 11/18/19 07:43 PM
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P0420 won't hurt anything other than annoying you with the CEL. My 2003 has one that comes and goes seemingly at random. I haven't been bothered enough to do any investigating on it as the fuel trims are fine, so the upstream AF sensors are working just as they should. Like others have said, its probably a lazy cat or downstream O2.


2008 Acura TL Type S-155k*
2003 Honda Accord V6-207k
Oil-Havoline ProDS 5W30 / *HM 5W20
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Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271236 11/18/19 07:48 PM
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maverickfhs Offline OP
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I'll start with techron or Berryman and an italian tune up and see if it takes care of it.

I literary drive like a grandpa laugh


2006 Civic EX 209K/AT
2006 Acura TSX 199K/AT
2007 Accord VP 154K/AT
Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271289 11/18/19 08:44 PM
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Originally Posted by maverickfhs
My occasionally driven 2007 accord with AT and ~154K miles - yesterday filled up the gas tank and after an hour or so drive, randomly started to throw up CEL.

28-30 or mpg are normal, through manual calculation and no performance issues.

Scanned it today and it was P0420 code, should I add techron and give it a try?

Or any other inputs and advise? Thank you thumbsup


I have 2 of these vehicles. Main problem is these vehicle has oil consumption problem. It burns oil and the oils gets trapped in the catalytic converter. If you get lucky, you can clear the CEL, and it might not come back on. You can try the GUMOUT Complete Fuel System cleaner and drive it until empty, it may help temporary.

Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271302 11/18/19 08:52 PM
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maverickfhs Offline OP
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Thanks, any idea if O2 sensors can be cleaned one by one? Does Bank 1 means, downstream sensor? Because I can clean it and see if it fixes CEL and then replace it.

Yeah I'll unhook battery negative and then see if CEL comes back too.


2006 Civic EX 209K/AT
2006 Acura TSX 199K/AT
2007 Accord VP 154K/AT
Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271328 11/18/19 09:32 PM
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Don't bother with the O2 sensors.....The odds of having one emulate a faulty Catalyst is astronomical.

Run a 18mm Antifouler on the O2 behind the Catalyst & move on with life.


2001 Chevy Camaro L92/4L80E
2006 Chevy 2500HD LBZ/Allison 1000
2010 Toyota Corolla 2ZR-FE/U341E
2000 Toyota Avalon 1MZ-FE/A541E
Re: 2007 Accord - P0420 Code [Re: clinebarger] #5271331 11/18/19 09:36 PM
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maverickfhs Offline OP
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Originally Posted by clinebarger
Don't bother with the O2 sensors.....The odds of having one emulate a faulty Catalyst is astronomical.

Run a 18mm Antifouler on the O2 behind the Catalyst & move on with life.


I actually have a fouler plug laying around, is that a similar one? Or it needs to be an 18mm one? So use an antifouler and remove downstream sensor or add antifouler with the sensor?

Appreciate your valuable help, as usual thumbsup


2006 Civic EX 209K/AT
2006 Acura TSX 199K/AT
2007 Accord VP 154K/AT
Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271336 11/18/19 09:38 PM
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slacktide_bitog Offline
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Rock Auto has a California-legal converter for less than $200. You should also replace the oxygen sensors along with the cat.

P0420 almost always means a bad cat (there are separate codes for oxygen sensors)

Bank 1 and Bank 2 refer to cylinder banks, like you'd see in a V6. An inline engine like your I4 will only have one bank, so it is Bank 1

Sensor 1 means the one before the cat, or "upstream"
Sensor 2 means the one after the cat, or "downstream"

Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271340 11/18/19 09:46 PM
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maverickfhs Offline OP
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Thanks for the help, it's an I4 and autozone scan says P0420 - Bank 1 catalyst system efficiency was below threshold for a predetermined period of time.

It means I should start with the upstream one first then or add an antifouler to downstream and call it a day?

Thanks all.


2006 Civic EX 209K/AT
2006 Acura TSX 199K/AT
2007 Accord VP 154K/AT
Re: 2007 Accord - P0420 Code [Re: maverickfhs] #5271352 11/18/19 09:53 PM
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slacktide_bitog Offline
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The downstream is the one that checks that the cat is working, the one that reports when the cat is not working, and the one that would cause the code to pop up.

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