Check Engine Light Due to Catalytic Converter Failure on Nissan Altima

The catalytic converter closest to the cylinder head can fail causing illumination of the Check Engine Light. Prompt repair of this problem is recommended because the catalyst material can be sucked into the engine and cause internal damage.

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Average mileage: 126,583 (11,800–260,000)
Exhaust & Emissions affected: 2.5L 4 Cylinder
14 model years affected: 1999, 2002, 2003, 2004, more2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014
213 people reported this problem
76 people shared problem details
2004 Nissan Altima166,000
Check Engine light is ON, Troubleshooting code P0420, Definition: Catalyst system efficiency below threshold- bank 1 probable cause: Large vacuum leak. Fuel System Fault. Ignition System fault. Failed Bank 1 Catalytic converter. Need advice of what should I fix first? thanks
2005 Nissan Altima87,000
My engine light has been on for 2 years. I have had things replaced and still the engine light is on. I need to get my tags this month and my car will not pass inspection with the engine light on. I never buy another nissan!!! Ty
2002 Nissan Altima123,500
Service Engine Soon light came on. Took to AutoZone for diagnostic. P0420 error. Currently seeking estimates for repair.
Check engine light came on last week and took car to dealer the next day. They checked and said that they would have to order part, waiting on call to see if it came in. Well, part finally came in and I took car to local Nissan dealer. Took the tech about two hours to change the converter and while he was at it also replaced master cyl under TSB that I didn't know about. I noticed a vast improvement while leaving the dealership as far as pep. I took the car for a long test drive and noticed more than a 4 mpg difference. Best of all, it didn't cost me a cent!
2002 Nissan Altima108,000
I was told the same problem but I don't know who to trust. Where should I take it?
2005 Nissan Altima126,000
Getting a service engine soon light and code says to replace catalytic converter
2006 Nissan Altima174,800
Service engine light came on, took to a shop who hooked up the diagnostic tool and it said it was the catalytic converter. Have to replace total cost 660.00
2005 Nissan Altima166,000
My check engine light came on and the auto mechanic said it is the Catalytic Converter Closest to the Cylinder Head needs to be replaced. I had a new one put on.
check engine soon light came on. They said it was 1 of 4 things. Large vacuum leak, fuel system fault, ignition system fault and failed bank 1 catalytic converter.
2005 Nissan Altima174,000
Check engine light went on. I took the car for a code check and it came up with the code in this article
2006 Nissan Altima11,800
code p-0420 cat-converter problems
2003 Nissan Altima210,000
Had Engine code P0300. Investigated problem. Found coil packs that go to spark plugs not seated tight enough to wiring harness. Used plastic tie straps to hold coil packs tight to wiring harness. Check engine light has been out for 3 weeks now.
2004 Nissan Altima97,000
check engine light code was identified as the front catalytic converter by a third party. We took the car to the dealer. Found out there is a service bulletin dated 2009. they will verify on Wed. If cat. is found to be defective dealer will repair at nissan expense.
2008 Nissan Altima60,000
I have had to have 3 catalytic converters replaced on my 2008 Nissan Altima because of this issue.
2010 Nissan Altima133,400
Chwck engine light Had to replace the cat
2010 Nissan Altima92,000
My engine light is on showing problem with the catalytic converter
2009 Nissan Altima157,000
check engine light on, went to auto zone and had the man to check codes, received code P0420 catalyst system efficiency below threshold- bank 1 Probable cause Large vacuum leak Fuel system fault Ignition system fault Failed Bank 1 catalytic converter
2014 Nissan Altima88,000
Cant fix in less 3500$ to fix it
2006 Nissan Altima141,000
Just came on last week, took to Nissan dealer wants 1050 to replace?
2006 Nissan Altima178,000
Engine is blown.
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