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: 127,128 (11,800–260,000)
Exhaust & Emissions affected: 2.5L 4 Cylinder
12 model years affected: 1999, 2002, 2003, 2004, more2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012
176 people reported this problem
61 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
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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
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2002 Nissan Altima123,500
Service Engine Soon light came on. Took to AutoZone for diagnostic. P0420 error. Currently seeking estimates for repair.
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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
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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!
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2005 Nissan Altima126,000
Getting a service engine soon light and code says to replace catalytic converter
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.
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 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
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.
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.
2005 Nissan Altima101,419
Engine needs service soon Short circut Replacement gasket cover.
2003 Nissan Altima144,525
My parents bought me this car and before they bought it they made sure everything was OK...The mechanic who they got it from was the one who always worked on it... Only problem it had wrong no big deal was oil needed to be changed and transmission fluid change and cracked windshield also it passed emissions... So they went ahead and bought it and when I they gave me the car I put in my first tank of gas and out of the blue the check engine light came on... I went and had it looked at and come to find out the cat converter was bad...and need to be replaced... So I need to know how that happened if all I did is put gas in and I ended up with a bigger problem...
2007 Nissan Altima188,000
Check engine light came on, P0420 error. Mechanic found my catalytic converter was cracked and needed to be replaced before my next inspection. He mentioned that I could wait but should get it done sooner then later because the exhaust fumes could leak into my car. He quoted $900 to fix it using Nissan parts. He mentioned that some of the after market parts don't come with a coating inside the catalytic converter which after 6 months or so the check engine light might come back on. There is an after market company in Ohio that solely makes catalytic converters and does put a coating inside of them. When the shop tested them they found the metal is too thin, causing it to crack after a year or so. While this is a mechanic telling me all of this, they are a family friend and a trusted source. Hopefully this helps someone!
1999 Nissan Altima80,000
My catalytic problem for my Nissan ultima is not yet fixed I am looking for a good mechanic around to fix it
2006 Nissan Altima130,000
It's not fixed and just today I was coming home from work and holding gas down the car suddenly wouldn't get over 40 miles per hour on prk way I let off the gas and pressed again and it toke forever to get at parkway speed I didn't know what to do. Pulled over shut car off and back on and car was normal again.. Had it tested and test said Cadillac convertor.. Thomas Kirby's 8595563079
2004 Nissan Altima103,769
Check engine light on. Code shows Catalytic Sensors, replaced. Still light on. Now the code is showing need to change the catalytic.
2002 Nissan Altima235,000
Second time this has come up. First was at 110000 miles. Was $1100 to fix the first time. I don't know if I'll be bothering to fix it again.
2005 Nissan Altima135,000
Engine light on. Catalytic converter.
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