FriendlyNismoTech

I think you misunderstood the advisor. The total cost should be around $1000 for parts and labor. Non techs cant access techline, but if you were to call they would tell you even though the service manual indicates everything else that post aboves says are possibilities, it will be 99%of the time the converter. I had an Armada today that had a 420 and 430 code. When I disassembled the system I found that Bank 2 converter and post o2 converter were completely empty, the majorit of bank 1 converter had blown out and was clogged in the post o2 converter. I spent an hour cleaning out the muffler to get all of the honeycomb out. However, if you want to have the other stuff verified have someone hook it up and monitor the A/F Alphas, and the ST/LT fuel trims. If these numbers are normal then you can bet on your converter being shot.

If you want to check something yourself, pull the heatshield off the manifold, this is also the converter for your vehicle. Inspected for yellow dust, and listen for exhaust blow. The QR25 is known for cracking them where the manifold welds to the converter on the backside near the block. I replace at least 2 a month under the 8/80k emissions warranty.

2006altima

Ok Thanks for the info. Greatly appreciated.

2006altima

So is this the part needed to replace the Converter/Manifold? The second one down Federal Emissions? I live in Arkansas and will never go to California. Plus the #2 gasket I would assume. And a front pipe seal?

Wow for these 3 parts shipped its $636.42 plus have to pay labor for someone to do it. It may be just as good to go to the dealer and pay the $1000 for parts and labor.

RockAuto seems alot cheaper but unsure of exact parts I need there.

2006altima

I emailed Rock Auto and this is what they sent back. Will someone please verify that this is correct? I will order if its my problem. Suppose to be going to my mechanic tonight to diagnose. Thanks.

Click Shopping Cart Tab in top right corner to view items.

2006altima

Turns out gonna be going tomorrow evening to see the Mechanic.

FriendlyNismoTech

You need 1,2, & 7. The manifold, and upper and lower gasket. The lower is actually called a bearing. Going to California has nothing to do with California emission. Vehicles sold in California have a different set of emissions they much abide by. So those cars have different exhaust systems.

2006altima

Ok but what about the link in post #19 the rock auto parts? Click on that then go over to shopping cart tab and the parts are in the cart. Will you look at them and check to see if there right? Its what rock auto sent me back that I need. Its much cheaper than the OEM Nissan site. Thanks again.

FriendlyNismoTech

Yes those are the right parts, don't worry about the heat shield bolts. They're standard M6x1.00, Just get them in 1" with a lock washer and washer.

2006altima

Thank you very much for your help and info.

FriendlyNismoTech

You're very welcome, there is a support bracket on the bottom of the cat that bolts to the block. Likely yours is broke. Have it repaired if you can or get a new one. If you leave it off you can actually damage the cat through torque rotation. Have a happy thanksgiving.

2006altima

Hey I hate to bug you again but I found this on ebay and was wondering if it would be ok to use it? Comes with Manifold/Converter and all gaskets and hardware to install. Please read it and let me know. Almost cant resist for $249 shiped to my front door. Thanks again!!

FriendlyNismoTech

Yes that will work as long as you're positive you don't have a California emissions car.

2006altima

How to I find this out about the California emissions?

FriendlyNismoTech

Easiest way I can think of is to look underneath and see if it has a 3rd O2 sensor after the secondary cat.

2006altima

Ok I can do that. I dont think it does. When we were having problems a few months ago we got the crankshaft and oxygen sensor replaced. I was only aware it had one oxygen sensor.