P0420 code.....possible causes?
Jun 7, 2006, 03:21 PM
#1
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P0420 code.....possible causes?
hi guys,
mods on the car:
Espelir downpipe
Helix hi-flow cat
Espelir catback
K&N drop in filter
about a month ago i started getting a P0420 code.
"Catalyst System Efficiency Below Threshold (Bank 1)"
i've reset the ECU twice now, the code goes away for a bout a week, then comes back.
i got it again yesterday.
it seems to me like this started happening with warmer weather in Cali.
what could be the problem?
i've had full exaust with hi-flow cat for about 5 months before this started happening without any issues.
mods on the car:
Espelir downpipe
Helix hi-flow cat
Espelir catback
K&N drop in filter
about a month ago i started getting a P0420 code.
"Catalyst System Efficiency Below Threshold (Bank 1)"
i've reset the ECU twice now, the code goes away for a bout a week, then comes back.
i got it again yesterday.
it seems to me like this started happening with warmer weather in Cali.
what could be the problem?
i've had full exaust with hi-flow cat for about 5 months before this started happening without any issues.
Jun 7, 2006, 03:59 PM
#5
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ehh, dont want to go through the hastle of driving arround with a test pipe.
i'm always scared of stopping at a red light with a cop next to me or behind me.
if i can smell it, i'm sure they can too.
i'm always scared of stopping at a red light with a cop next to me or behind me.
if i can smell it, i'm sure they can too.
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Jun 7, 2006, 04:02 PM
#8
Try the single sparl plug antifouler trick listed in the how to section and keep your high flow cat. You may still have to swap in your stock cat at emissions time if your high flow is not doing the trick.
Jun 7, 2006, 04:04 PM
#9
Originally Posted by DynoFlash
0420 code = "lack of use of search feature"
Jun 7, 2006, 04:07 PM
#10
Originally Posted by bigfishs
Try the single sparl plug antifouler trick listed in the how to section and keep your high flow cat. You may still have to swap in your stock cat at emissions time if your high flow is not doing the trick.
Jun 7, 2006, 04:28 PM
#11
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Originally Posted by DynoFlash
0420 code = "lack of use of search feature"
Last edited by Dr.Sound; Jun 7, 2006 at 04:53 PM.
Jun 7, 2006, 05:19 PM
#12
Well if its any consolation, I got the same code despite me still being on the stock exhaust a few months ago. Every week or so, I kept getting the P0420 until I eventually changed out my stock cat for a 2.5" Ultimate Racing test pipe. I haven't gotten a CEL since, and no, I am not taking it in for warranty either lol. Only had about 4500 miles before it started giving me issues and I only had a flash at the time.
