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#1 Old 08-24-2010, 10:31 PM
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Catalytic Converter

Hi group.

Anyone out there ever change a Catalytic Converter? I have a 2003 Altima with 200,500 miles on it. How hard is it to do and is there a video out there (maybe You Tube, I learned how to chance my brake pads this way) that can give me instructions? I live in California and I finding it hard to find one online because of the tough guidelines in this state. And I've been also told that I have to buy it from the dealer only, then I hear that you can buy them from the junkyard. Which is true or is both correct? Any information on this will be very helpful. Thanks in advance.

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#2 Old 08-24-2010, 10:46 PM
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do you have a 3.5L or 2.5L. If you have a 3.5L which cat do you need to replace? Racingline has some attractive options if you have a 3.5
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#3 Old 08-24-2010, 11:50 PM
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3.5L and I think it's the right side
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#4 Old 08-25-2010, 12:05 AM
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#5 Old 08-25-2010, 12:52 AM
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Geeezzz 3! I thought it was just 2. I'll have to find out. A mechanic told me just the one on the right side. I going to see the mechanic tomorrow and ask him to clarify it for me. How difficult is it to change?
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#6 Old 08-25-2010, 02:46 AM
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On the right side? I think you better find a new mechanic.

You'll have to remove your factory ypipe (which you were going to do anyway because you were just about to order a Racingline Ypipe) and then the front cat is a breeze. 4 14mm bolts from the bottom, 2 from the top. The firewall side is a little tougher to reach. There are 2 14mm bolts you reach from the bottom and 2 14mm nuts you have to get from the top. I got to my top by removing the upper intake manifold assembly. It's not hard, just time consuming. There's also an aluminum compression ring that has to be replaced on top of the rear cat. Don't reuse it or you'll get a P1273 exhaust leak code like mine.

Taz...If only I had known my cats were going to be coming off during my y install...And if I had the extra dough. But...They're coming off again to troubleshoot my exhaust leak. So I guess I'm just in need of dough.

Edit: I suppose I should add "if the new product is ready"...

Just looked! They're on the site! Holy balls! I'm drooling...I need to sell something.



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Last edited by Penguinchit; 08-25-2010 at 02:48 AM.
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#7 Old 08-25-2010, 12:37 PM
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Originally Posted by Penguinchit View Post
I need to sell something.
Sell your body loverboy...

I think I need to check out some cats too, I'm getting that rotten egg smell everytime I get on it...

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#8 Old 08-25-2010, 05:21 PM
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Thanks for the information, I'm going to do this myself. It sounds pretty easy. Have either of you ever change your spark plugs. I hear the front one are easy but the 3 in the back are hard to get to.
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#9 Old 08-25-2010, 05:56 PM
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^Yep...Haven't had the pleasure of doing plugs yet...The rear bank from what I have heard/read is a real bitch to get at.

There's a tutorial floating around here somewhere if you want to take on the job yourself.

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#10 Old 08-25-2010, 06:40 PM
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I believe these are each correct to the 04-06 2.5L as i have an 06 and from my reading they changed after 03 on the 2.5L engine.

Hope this helps, would love it if someone has gone through this and would recommend which they went with or other options.

I dont understand skipping the precat with the O2 sensor so if someone wants to chime in thats cool too.

Has anyone done this make a DIY? or is there a sticky? Seems like the more i search the more people i am finding looking for info too

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#11 Old 08-26-2010, 06:08 AM
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#12 Old 08-26-2010, 12:52 PM
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#13 Old 08-26-2010, 01:13 PM
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Quote:
Originally Posted by taz View Post
^^^ those are all for a 2.5L. The OP has a 3.5L V6..........
My Bad, I missed that in the post from OP. A least my mistake might be better then starting a new thread on same topic?
ThreadJack!
Taz any estimate on pre-cats for the 2.5? In the QR engine thread it says maybe soon!?

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  Nissan Forums : Nissan Forum > Nissanclub.com Nissan - Infiniti Enthusiast Forums > NISSAN ALTIMA FORUMS > 2002-2006 Nissan Altima Forums > 2002-2006 Nissan Altima Discussion (2.5 & 3.5)

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