Check Engine Light Came On Again, Code P0420 Options

[bindertch]

ya i kept everything when i get it smogged. so theres no way at all that it will pass!?

well you just cut the catalyst to less than half so no. You might want to look into a universal cat that is meant for a 2.2L engine. I won't be able to pass my car either but with the start-up smoke I wouldn't think it would pass anyways.

well bought a new O2 sensor and reset the ecu, hope this rids this problem

it won't, the second o2 sensor is just for monitoring the cat and if you removed it they are seeing a problem

Yep exactly what I was saying. If the second O2 sensor was after the second cat it might get a low enough reading to not trigger the CEL.

[Bitter]

try getting a universal cat thats meant for a large V8, 5.7-6.0L. with that inplace of your stock cat it should have enough capacity to let you pass. if not then just run the big cat and your stock cat.

[LewFX]

well since i know the guy who does the smog, ill try it with a header, hell he passed me with a cai thats not spose to pass. if not ill slap the old stock stuff on

[LewFX]

well what do you know, it came on again, what a sucky day im having

[LewFX]

should i cut the bottom sensor and jimmy it to the top o2 sensor? (splice into it)

[Bitter]

no, dont do that. extend the sensor and have it placed after the cat converter. that should eliminate the problem, or get an O2 sim.

[Bitter]

http://www.club3g.com/forum/showthread.php?t=55284 if the sensor looks like the one the 3G eclipse uses then you can try that solution, otherwise theres actualy things called O2 simulators, search them online and you should find them or find out more about them, possibly how to make your own.

[LewFX]

ill try that.

[LewFX]

k bought some anti-seize, the 2 foulers, drilled it, all set to do it tomorrow...does anyone else with this header, not using a dp gasket? and if they are how much was it.

[LewFX]

okay i got the fix done today, lets hope this fixes the CEL problem



This post has been edited by LewFX: Jun 12, 2006 - 6:31 PM

[Bitter]

cool, keep us updated as to wether or not it works