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: 126,659 (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
167 people reported this problem
56 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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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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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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2005 Nissan Altima126,000
Getting a service engine soon light and code says to replace catalytic converter
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2002 Nissan Altima108,000
I was told the same problem but I don't know who to trust. Where should I take it?
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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.
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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
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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.
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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.
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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.
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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.
2011 Nissan Altima81,500
Service engine light came turned on a Monday so I went to several shops to have it diagnosed code error came out to be the catalytic converter. Surprisingly the light went away on its own in Wednesday. During this time my inspection was due so I immediately went to have it done and it passed. All I can pray now is that it was some kind of misfire and the light doesn't return and end up paying $1200
2005 Nissan Altima86,000
check engine light due to faliure of cataytic converter closet to cylinde head. and now shows crank shaft and speed sensor.
Check engine light goes on for a few days and then goes off for a few weeks. Had check engine light checked while on. Said it was a malfunctioning catalytic converter.
My light on my car
2005 Nissan Altima132,000
Had multiple codes when my engine light came on. Including the catalytic converter code. Turned out my battery was bad and replacing it cleared most of the errors. Shop repaired the rest. But < 100 miles later the light was back on and it was the catalyst system code again
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