How to get rid of Check Engine Light for Cats on 360?

Most states will let you have up to two not ready as long as one of them is not the cat. Most shops cant be bothered with a visual by me. Time is money and as long as it passes they couldn't care less how you did it.

 

Ok I read with interest the technical details....now for the Rube Goldberg fix? I created a tiny prancing horse sticker that blanks over the CEL (mine relates to the vapor recovery sensor) If I strain I can still see the light especially if it flashes. Every so often I read the codes to be sure. My heirs will have to deal with it...I warned you a hokey fix.

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All monitors get completed in my car and the smog technician didn’t say nothing about my headers nor my 02 extenders. The visual inspection is a matter of luck,I don’t know anyone who has been failed due to headers, cats yes all the time but not headers (honestly how many technicians are familiar with precats inside headers?)


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I might do the same but it would still fail in my state because they plug into it. But if you don't have emissions testing that would work. As long as you don't end up with another issue that you ignore thinking its the o2's.

 

Ok. So you managed to get by smog this time but that is no guarantee for any future test. The car is not smog compliant and technically a cop can ticket that. Everyone can do what they want but ‘I got mine through’ is not the same as ‘the configuration passes CA smog (read legal)’.


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True but you said “won’t pass smog” like a technician would automatically fail the car (like with cats) and that is not strictly necessary.
I don’t think a cop would know about precats if even smog technicians are not aware.
It is that route or buying OEM headers that will keep failing OR hollow the original headers that it is also “illegal”
So the only 3 options are:
1 buy new OEM headers ($$$$) and repeat in the future.
2 aftermarket headers with 02 extend extenders and cross fingers every 2 years
3 hollow the original headers

2 and 3 are technically “illegal” but also the front license plate.




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Have people who just hollowed the original headers with OEM cats mostly been getting CELs?

 

Well two things here
The idea of replacing the headers is to prevent the precat failure.
That fix comes with a compromise, you might get CELs si installing 02 extenders or mini cats is a solution that most of the time works but sometimes it doesn’t. OR you could install brand new OEM headers (very expensive and that will fail for sure in the future)
There is no free lunch about this


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If I did the Fabspeeds, I would want to have that metal heat shielding welded over them, but I think it’s dumb that they don’t come that way. So I think I’ll just have mine hollowed and then try the sensor extendors if I get CEL... fortunately I’m a WA resident so no emissions testing.

 

The rears. I put a set on last week and when i just checked it everything is satisfied. But it also went about 300 miles last time before it picked up an o2 code so we will see. I bought the straight mini cats and 90 deg elbows but only have the straights on the car right now.

 

My solution does not require any 'dongles' fitted. It actually software which alters the behaviour directly in the software of the ignition computers themselves so it won't ever generate a CEL for catalyzers ever again, you can in effect run test pipes and you wont get a CEL. It in effect disables the 'feature' to trigger the CEL itself and then you reflash your ignition computers with the 'patched' versions.

I'm doing it so it can be enabled/disabled features any time you want, first prototype testing is already ongoing. Won't be long now boys!

 

“2 after the cats”
Only if your car is a 99, otherwise the downstream (rear) 02 sensors are connected to the cats in the middle, after the first set or cats inside the main Catalytic converter but before the bigger ones.
You should take a look at the thread I copied the link
All the info you need is there.



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360trev - keep us posted. Thx.

 

Oh yeah.. also keep in mind after 25 yrs old in tx... no emmissions testing.... just safety. counting down the years.

 

I had this problem (CA car), tried all of the inexpensive fixes, no luck, replaced the exhaust manifolds from an auto wrecker with a 360 with 25K miles on it, fixed.

 

I started a thread on this same problem ... https://www.ferrarichat.com/forum/threads/p0421-p0431-trouble-codes-catalytic-converter-anyone-have-good-fix.552866/

I have had about 4 months now of driving without any CELs.

My set up:

• Fabspeed headers
• Stock cats

My issues:

• P0421/P0431 codes ... warm up catalyst efficiency below threshold
  
• P0159 code ... O2 sensor circuit slow response Bank 2, Sensor 2

My fix:

• Purchased two mini cats from Big Daddies Garage
• Purchased two right angle extenders ... note, the Big Daddies extenders will not allow you to thread onto the bung without pulling the catalytic converter
  
• Purchased two extenders

The mini-cats are installed with a right angle extender ... https://www.ferrarichat.com/forum/threads/p0421-p0431-trouble-codes-catalytic-converter-anyone-have-good-fix.552866/page-18#post-145878835

This fixed the P0421/P0431 codes, but after a bit got the P0159 code.

I cleared the P0159 code and it has not come back. Cannot say with certainty that it is 100% resolved, but so far no codes for P0421/P0431. I am keeping fingers crossed.

Steve

 

It is the post 17, Bisel also posted it above
We discussed it very thoroughly months ago and honestly I don’t know why it didn’t become a sticky
Every single one solution is listed there

When I quoted your “2 after the cats” I meant the word “after” but you still have two sets, one at the headers (upstream) and one at the middle of your cats between the first and second sets inside your main cats (you will understand when you see the thread and the pictures I posted there) but you still have 2 sets of 02 sensors in your model.

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Search tool is a PITA after the upgrade
Take a look at the thread everything is there trust me


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An aftermarket muffler should not throw a CEL, headers maybe a different story. Custom tune is not a big deal at all, had mine done much improved throttle response and low to mid power. Check out auto racing technik in heidelberg. Tunes a lot of Ferrari’s and tubi authorised shop. Alvin tuned my 360

 

As far as I know, I've only got an aftermarket muffler.... What did it cost for the tune, if you don't mind me asking?

 

$2.5k off the top of my head. Alvin can do your major as well at the same time!

 

Set up your O2 sensors in same locations as a 99 model. It will pass smog and no light.