Catalytic Converter

Post by **tpettis0505** » Tue Jan 23, 2018 1:42 pm

hello, I would like to know if anyone has replace their Catalytic Converter on the M56? If so, was it an aftermarket Cat or Dealer? I was told that the cat on the driver side of my vehicle was going bad so I will need to replace it. Just looking for information from people who has experience this issue. Thanks,

Post by **Ilya** » Tue Jan 23, 2018 2:55 pm

Which one? The lower or upper? As far as I know, the upper requires engine removal, etc.

Post by **armybrat** » Tue Jan 23, 2018 4:02 pm

tpettis0505 wrote: ↑
Tue Jan 23, 2018 1:42 pm
hello, I would like to know if anyone has replace their Catalytic Converter on the M56? If so, was it an aftermarket Cat or Dealer? I was told that the cat on the driver side of my vehicle was going bad so I will need to replace it. Just looking for information from people who has experience this issue. Thanks,

I personally haven't had to replace mine. The primary cats are integrated into the exhaust manifolds. You have to replace the whole manifold. Unfortunately, the driver's side requires pulling the motor to replace it. Around $2K dealer price. The passenger side can be changed with the motor in place. With that said, I would take the front Y-pipe loose and inspect the inside if possible. Also check A/F sensors and O2 sensors. You may be able to clean them and recheck codes.

Post by **walt1227** » Thu Jan 25, 2018 11:01 am

For the price you would be better off having some custom headers made if it is the main cats and not secondary cats. Think Kooks would make some for us around $3k.

Post by **armybrat** » Sun Jan 28, 2018 10:34 am

walt1227 wrote: ↑
Thu Jan 25, 2018 11:01 am
For the price you would be better off having some custom headers made if it is the main cats and not secondary cats. Think Kooks would make some for us around $3k.

Headers would be really nice, but you would still need aftermarket cats installed to pass emissions. (if you live in a state that requires it) The ports for the A/F and O2 sensors would also have to be welded in...then the installation. That would bump the price up even more. For a daily driver, especially with a stock tune, I believe I would just replace the manifold. I would also look into why the cat went bad. As a general rule, they can last the lifetime of the car. What kind of gas is the OP using? Driving habits? Using fuel additives? Following proper maintenance? Just a thought.

Post by **tpettis0505** » Wed Jan 31, 2018 1:40 pm

Ilya wrote: ↑
Tue Jan 23, 2018 2:55 pm
Which one? The lower or upper? As far as I know, the upper requires engine removal, etc.

It's the Upper Cat.

Post by **Ilya** » Wed Jan 31, 2018 4:38 pm

Yeah, that's gonna be a PITA to do...stupid design by Infiniti. Probably to force people to go to the dealer for this work and getting $$$$ from customers.

Post by **Kboakye87** » Wed Feb 14, 2018 9:16 am

Is this covered by Elite Warranty?

YouTube · Post by **EdBwoy** » Wed Feb 14, 2018 9:36 am

Kboakye87 wrote: ↑
Wed Feb 14, 2018 9:16 am
Is this covered by Elite Warranty?

I am not sure about the elite warranty, but there is a federal warranty that could cover the OP depending on mileage, date of purchase etc.

Here's a link to another other thread whose solution we'll never get to know:
post6720244.html

Brandengonzo · Post by **Brandengonzo** » Sun Dec 15, 2019 2:23 pm

Hey guys, I saw this thread when I was looking for information about changing the cat.
I work at a japanese repair specialty shop and we have a 2011 m56 with the bank 1 cat that has gone bad. All data, identifix, and pro demand had no information about the procedure to remove the exhaust manifold/cat for bank 1. So I winged it. Unbolted the y pipe, unbolted the support plate for the steering rack, removed the column from the steering rack via the slip yoke that bolts onto the steering rack, hung the steering rack with a bungee cord, unbolted the sway bar at the sway bar bushing and let it hang by the links, supported the engine from the top on the drivers side head ground bolt, remove the drivers side motor mount, then I just slipped the manifold out the space between the subframe, and the firewall.
So no need to remove the engine. The whole process took 4 hours including replacing the upstream and downstream 02 sensor

Post by **Ilya** » Sun Dec 15, 2019 4:14 pm

Brandengonzo wrote: ↑
Sun Dec 15, 2019 2:23 pm
Hey guys, I saw this thread when I was looking for information about changing the cat.
I work at a japanese repair specialty shop and we have a 2011 m56 with the bank 1 cat that has gone bad. All data, identifix, and pro demand had no information about the procedure to remove the exhaust manifold/cat for bank 1. So I winged it. Unbolted the y pipe, unbolted the support plate for the steering rack, removed the column from the steering rack via the slip yoke that bolts onto the steering rack, hung the steering rack with a bungee cord, unbolted the sway bar at the sway bar bushing and let it hang by the links, supported the engine from the top on the drivers side head ground bolt, remove the drivers side motor mount, then I just slipped the manifold out the space between the subframe, and the firewall.
So no need to remove the engine. The whole process took 4 hours including replacing the upstream and downstream 02 sensor

Branden, thank you for this post. Any chance you have some pictures? That would be a GREAT help to the community.

Brandengonzo · Post by **Brandengonzo** » Sun Dec 15, 2019 4:42 pm

Yea for sure I can take pictures tomorrow at work. The vehicle is still there for other services so i will just draw arrows to the parts I was speaking of since i already finished the job

YouTube · Post by **EdBwoy** » Sun Dec 15, 2019 8:30 pm

Brandengonzo wrote: ↑
Sun Dec 15, 2019 2:23 pm
...
So no need to remove the engine. The whole process took 4 hours including replacing the upstream and downstream 02 sensor

Thanks for sharing that info. I have done the same for an 06 M45, raising the engine by jacking the oil pan, because I didn't have a way to hold it from the top.

Do you recall seeing anything visibly wrong with the catalytic converter when you removed it?
I've been trying to acquire a bad catalytic converter for a long time.

Post by **Ilya** » Mon Dec 16, 2019 12:49 pm

Brandengonzo wrote: ↑
Sun Dec 15, 2019 4:42 pm
Yea for sure I can take pictures tomorrow at work. The vehicle is still there for other services so i will just draw arrows to the parts I was speaking of since i already finished the job

You da man, man.

Also, if you have the bad cats and can share, as Ed says, lets do it so we can try to get some visibility into this issue as it's starting to affect more and more V8's as they hit certain mileages.

Post by **Yoda's Master** » Mon Dec 16, 2019 2:12 pm

We want headers and down pipes

Post by **rjoe** » Thu Dec 19, 2019 11:58 am

About to take on this project. Dealer gave me a $2,500 quote to replace the passenger cat, header, upstream o2, and gaskets. They replaced the driver's side under warranty about 2 years ago, very glad that was at least covered under warranty.

Any pics would be helpful Brandengonzo

Post by **Mjkkb2** » Thu Dec 19, 2019 1:27 pm

Kboakye87 wrote: ↑
Wed Feb 14, 2018 9:16 am
Is this covered by Elite Warranty?

It should.

Post by **rjoe** » Fri Dec 20, 2019 12:03 am

Mjkkb2 wrote: ↑
Thu Dec 19, 2019 1:27 pm

Kboakye87 wrote: ↑
Wed Feb 14, 2018 9:16 am
Is this covered by Elite Warranty?
It should.

They did my driver’s side under Elite warranty @ no cost.

Catalytic Converter

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