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Old June 29th, 2020, 05:19 PM   #1 (permalink)
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Code P0431

what does this mean? Is there much to worry about?
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Old June 29th, 2020, 06:57 PM   #2 (permalink)
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Bad catalytic converter in your exhaust

It could be very bad depending on how bad it gets

It’s clogged up and eventually once it clogs up too much your engine will lose serious power, possibly overheat, and the cat could break apart and get sucked back into your engine or shot further dow your exhaust getting stuck in the next cat
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Old June 29th, 2020, 07:12 PM   #3 (permalink)
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Quote:
Originally Posted by pcfreak4 View Post
Bad catalytic converter in your exhaust

It could be very bad depending on how bad it gets

It’s clogged up and eventually once it clogs up too much your engine will lose serious power, possibly overheat, and the cat could break apart and get sucked back into your engine or shot further dow your exhaust getting stuck in the next cat
So to the shop it goes?
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Old June 29th, 2020, 07:12 PM   #4 (permalink)
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Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
Bad catalytic converter in your exhaust

It could be very bad depending on how bad it gets

It’s clogged up and eventually once it clogs up too much your engine will lose serious power, possibly overheat, and the cat could break apart and get sucked back into your engine or shot further dow your exhaust getting stuck in the next cat
So to the shop it goes?
Is your car the 4cyl or 6cyl? Aftermarket exhaust headers? Tune? When were the O2 sensors replaced last?
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Old June 29th, 2020, 07:14 PM   #5 (permalink)
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Quote:
Originally Posted by pcfreak4 View Post
Bad catalytic converter in your exhaust

It could be very bad depending on how bad it gets

It’s clogged up and eventually once it clogs up too much your engine will lose serious power, possibly overheat, and the cat could break apart and get sucked back into your engine or shot further dow your exhaust getting stuck in the next cat
How would I know which cat is bad?
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Old June 29th, 2020, 07:15 PM   #6 (permalink)
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Quote:
Originally Posted by pcfreak4 View Post
Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
Bad catalytic converter in your exhaust

It could be very bad depending on how bad it gets

It’s clogged up and eventually once it clogs up too much your engine will lose serious power, possibly overheat, and the cat could break apart and get sucked back into your engine or shot further dow your exhaust getting stuck in the next cat
So to the shop it goes?
Is your car the 4cyl or 6cyl? Aftermarket exhaust headers? Tune? When were the O2 sensors replaced last?
4cyl SE, stock exhaust, stock tune, did a intake resonator delete and fuel bypass, O2 sensors were replaced about 5months ago i belive.
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Old June 29th, 2020, 07:29 PM   #7 (permalink)
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Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
Bad catalytic converter in your exhaust

It could be very bad depending on how bad it gets

It’s clogged up and eventually once it clogs up too much your engine will lose serious power, possibly overheat, and the cat could break apart and get sucked back into your engine or shot further dow your exhaust getting stuck in the next cat
So to the shop it goes?
Is your car the 4cyl or 6cyl? Aftermarket exhaust headers? Tune? When were the O2 sensors replaced last?
4cyl SE, stock exhaust, stock tune, did a intake resonator delete and fuel bypass, O2 sensors were replaced about 5months ago i belive.
That’s a code for bank 2, but doesn’t matter, the whole manifold houses both pre cats

There is another fix but we aren’t allowed to discuss it legally

Fuel bypass?

U think they were replaced? Were they, or were they not?
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Old June 29th, 2020, 07:41 PM   #8 (permalink)
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Quote:
Originally Posted by pcfreak4 View Post
Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
Bad catalytic converter in your exhaust

It could be very bad depending on how bad it gets

It’s clogged up and eventually once it clogs up too much your engine will lose serious power, possibly overheat, and the cat could break apart and get sucked back into your engine or shot further dow your exhaust getting stuck in the next cat
So to the shop it goes?
Is your car the 4cyl or 6cyl? Aftermarket exhaust headers? Tune? When were the O2 sensors replaced last?
4cyl SE, stock exhaust, stock tune, did a intake resonator delete and fuel bypass, O2 sensors were replaced about 5months ago i belive.
That’s a code for bank 2, but doesn’t matter, the whole manifold houses both pre cats

There is another fix but we aren’t allowed to discuss it legally

Fuel bypass?

U think they were replaced? Were they, or were they not?
O2 sensor was replaced in January, i did not do a fuel bypass.
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Old June 29th, 2020, 07:49 PM   #9 (permalink)
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[QUOTE=Walketfretts;1917565]
Quote:
Originally Posted by pcfreak4 View Post
Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
Bad catalytic converter in your exhaust

It could be very bad depending on how bad it gets

It’s clogged up and eventually once it clogs up too much your engine will lose serious power, possibly overheat, and the cat could break apart and get sucked back into your engine or shot further dow your exhaust getting stuck in the next cat
So to the shop it goes?
Is your car the 4cyl or 6cyl? Aftermarket exhaust headers? Tune? When were the O2 sensors replaced last?
4cyl SE, stock exhaust, stock tune, did a intake resonator delete and fuel bypass, O2 sensors were replaced about 5months ago i belive.
That’s a code for bank 2, but doesn’t matter, the whole manifold houses both pre cats

There is another fix but we aren’t allowed to discuss it legally

Fuel bypass?

U think they were replaced? Were they, or were they not?
O2 sensor was replaced in January, i did not do a fuel bypass. I meant coolant bypass. Sorry
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Old June 30th, 2020, 08:21 AM   #10 (permalink)
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You’re gonna need a racing header from RRE with rear O2 spacers or a tune (these are in very limited or not even in production now), new manifold from Mitsubishi to stay road legal and not require a tune, or gut your current manifold and use rear O2 spacers or a tune

Don’t get one of those cheap eBay Chinese manifolds, they don’t have the correct front O2 bungs

One one of these options we can recommend for road legal emissions compliant use, replacing it with a brand new manifold with cats

Last edited by pcfreak4; June 30th, 2020 at 08:23 AM.
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Old June 30th, 2020, 10:04 AM   #11 (permalink)
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Originally Posted by pcfreak4 View Post
You’re gonna need a racing header from RRE with rear O2 spacers or a tune (these are in very limited or not even in production now), new manifold from Mitsubishi to stay road legal and not require a tune, or gut your current manifold and use rear O2 spacers or a tune

Don’t get one of those cheap eBay Chinese manifolds, they don’t have the correct front O2 bungs

One one of these options we can recommend for road legal emissions compliant use, replacing it with a brand new manifold with cats
Can you send me a link for the Headers?
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Old June 30th, 2020, 11:23 AM   #12 (permalink)
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Originally Posted by pcfreak4 View Post
You’re gonna need a racing header from RRE with rear O2 spacers or a tune (these are in very limited or not even in production now), new manifold from Mitsubishi to stay road legal and not require a tune, or gut your current manifold and use rear O2 spacers or a tune

Don’t get one of those cheap eBay Chinese manifolds, they don’t have the correct front O2 bungs

One one of these options we can recommend for road legal emissions compliant use, replacing it with a bran
d new manifold with cats
Also what kind of O2 sensor spacer would I need?
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Old June 30th, 2020, 12:00 PM   #13 (permalink)
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http://roadraceengineering.com/blog/...eclipse_parts/

This comes with spacers, do not use spacers on your clogged manifold
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Old June 30th, 2020, 12:35 PM   #14 (permalink)
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Originally Posted by pcfreak4 View Post
http://roadraceengineering.com/blog/...eclipse_parts/

This comes with spacers, do not use spacers on your clogged manifold
Was just about to say I figured it out haha. Just put the order in for the manifold. Iv been reading the how to and doesn't seem too difficult for this car.
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Old June 30th, 2020, 01:17 PM   #15 (permalink)
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Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
http://roadraceengineering.com/blog/...eclipse_parts/

This comes with spacers, do not use spacers on your clogged manifold
Was just about to say I figured it out haha. Just put the order in for the manifold. Iv been reading the how to and doesn't seem too difficult for this car.
Only difficult part will be the stuck bolts, heat and PBBlaster will help

Make sure u clean the surface good and use a new gasket
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Old July 3rd, 2020, 04:41 PM   #16 (permalink)
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Quote:
Originally Posted by pcfreak4 View Post
Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
http://roadraceengineering.com/blog/...eclipse_parts/

This comes with spacers, do not use spacers on your clogged manifold
Was just about to say I figured it out haha. Just put the order in for the manifold. Iv been reading the how to and doesn't seem too difficult for this car.
Only difficult part will be the stuck bolts, heat and PBBlaster will help

Make sure u clean the surface good and use a new gasket
I shouldn't have jinxed it, won't be in until August, had the car in and I even saw for myself the exhaust manifold is cracked and not clogged, so I'm apperantly now on a waiting list with RRE because their metal factory is shut down cuz of Covid (southern California based). As to a temporary fix so I can at least safely get too and from work (15min drive) what should I do? I was gonna use the copper gasket I bought for the new part isntall.
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Old July 3rd, 2020, 06:41 PM   #17 (permalink)
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Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
http://roadraceengineering.com/blog/...eclipse_parts/

This comes with spacers, do not use spacers on your clogged manifold
Was just about to say I figured it out haha. Just put the order in for the manifold. Iv been reading the how to and doesn't seem too difficult for this car.
Only difficult part will be the stuck bolts, heat and PBBlaster will help

Make sure u clean the surface good and use a new gasket
I shouldn't have jinxed it, won't be in until August, had the car in and I even saw for myself the exhaust manifold is cracked and not clogged, so I'm apperantly now on a waiting list with RRE because their metal factory is shut down cuz of Covid (southern California based). As to a temporary fix so I can at least safely get too and from work (15min drive) what should I do? I was gonna use the copper gasket I bought for the new part isntall.
It’s cracked before the cat? Interesting, honestly not too sure why that’d happen, unless the cat was clogged and then caused so much back pressure that it forced the manifold to crack from pressure

To keep driving it? I’d just leave it cracked for now
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Old July 7th, 2020, 04:07 AM   #18 (permalink)
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Quote:
Originally Posted by pcfreak4 View Post
Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
Quote:
Originally Posted by Walketfretts View Post
Quote:
Originally Posted by pcfreak4 View Post
http://roadraceengineering.com/blog/...eclipse_parts/

This comes with spacers, do not use spacers on your clogged manifold
Was just about to say I figured it out haha. Just put the order in for the manifold. Iv been reading the how to and doesn't seem too difficult for this car.
Only difficult part will be the stuck bolts, heat and PBBlaster will help

Make sure u clean the surface good and use a new gasket
I shouldn't have jinxed it, won't be in until August, had the car in and I even saw for myself the exhaust manifold is cracked and not clogged, so I'm apperantly now on a waiting list with RRE because their metal factory is shut down cuz of Covid (southern California based). As to a temporary fix so I can at least safely get too and from work (15min drive) what should I do? I was gonna use the copper gasket I bought for the new part isntall.
It’s cracked before the cat? Interesting, honestly not too sure why that’d happen, unless the cat was clogged and then caused so much back pressure that it forced the manifold to crack from pressure

To keep driving it? I’d just leave it cracked for now
For the headers, you did not get a check engine light after install? Do the spacers for the O2 sensors do their job properly?
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Old July 7th, 2020, 04:47 AM   #19 (permalink)
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The spacers are intermittent

They work decently but every now and again you might get a code for it, which you can try to adjust the hole in your spacers

The tune is nice because you just know that it’s taken care of for good
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Old July 8th, 2020, 08:47 PM   #20 (permalink)
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Spacers never worked for me. They broke my sensors or maybe I did installing the spacers but Fastworks tune DID work. I had to replace my broken o2 sensors for it to work but now im happy with no SES light.
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