A few peoples have had the same problems as your soon after the IPDM failure.
I was reading somewhere that with the failure of the IPDM, the ECU dump too much gas, causing cats failure

 

^^^what he said, happened to me. The raw fuel destroys the CATS. if you under 80k It should be fixed under warranty. If not then get some high flow cats installed. The factory cats are attatched to the exhaust manifold and come one piece.

I wouldn't tell the dealer your IPDM when bad.

 

Just dumping some bad gas kills the Catalytic Converters in a matter of weeks...unfortunately I am 84,000 miles.

 

Yeah, just take it in and say "what does this light mean?". And they will fix it under the 8/80k warranty (if you are still within the mileage). Good luck!

 

Or headers, highflow cats, Uprev

 

My new IPDM came in the mail today. I just have to unplug & replug also there are two unused fuse inlets what are these for.

 

Is it possible to just remove the old converters and put some new cats further down stream, which would make it lots easier to replace in the future. Has anyone done this before? My light has been on for a couple of weeks now and i was thinking about this option if it is possible.

 

You would have to go with some kind of after market headers if you want to go that route. The OEM primary cats are welded to the exhaust manifolds.

 

Think mine are on there way out, went to autozone for a scan and got 3 codes
P0420> P0430

Large vacuum leak
Fuel system faulty
Ignition system faulty
Failed Bank 1 & 2 catalytic converter

P0461>

Open or short circuit condition
Poor electrical connection
Faulty fuel level sensor

Not to sure how accurate those scanners.

 

My check engine light came on last fall. Began to drink oil, Nissan replaced my longblock at 93000 miles (I have extended warranty) due to cat failure. They only replaced the bad one, now truck back in shop 3000 miles later with another cat code......Nissan needs to buy my truck (love my Titan) or replace another longblock with only 3020 miles on it. DUMBASSES! Dealer says they wouldnt pay for the other one 3 months ago during the swap. UNFRICKINBELIEVABLE.

 

I had the same issue as you with about 96,000. Nissan replaced long block and put new cats on 1.5 yrs ago. I noticed today I'm puffing smoke out the tail. Did Nissan do anything for you?

 

Hi Cleary,

Well, when they replaced the second (original) cat they reassured me of no damage this time. Seeing that the replacement longblock is now covered for an additional 50,000 miles, I think we are in good shape. Time will tell....

--Rick