Car Problem Reports

Nissan Altima Check Engine Light Due to Failure of Catalytic Converter Closest to Cylinder Head

Nissan Altima Problem
59 Reports
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Model Years Affected: 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010

Exhaust & Emissions Affected: 2.5L 4 Cylinder

Average Mileage: 113,409 mi (13,000 mi - 185,000 mi)


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.

  • Visitor, , 166,000 mi

    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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  • Visitor, , 123,500 mi

    Service Engine Soon light came on. Took to AutoZone for diagnostic. P0420 error. Currently seeking estimates for repair.

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  •  Rookie

    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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  • Visitor, , 126,000 mi

    Getting a service engine soon light and code says to replace catalytic converter

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  • Visitor, , 174,800 mi

    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 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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  • Visitor, , 108,000 mi

    I was told the same problem but I don't know who to trust. Where should I take it?

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  • Visitor, , 123,500 mi

    Service Engine Light came on. Dealer and independent muffler shop both diagnosed as only one code-the P0420 Catalytic Converter. Both said it should be replaced. 2 days later, the light went off. There is slight hesitation while driving, some minor 'sputtering'

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  • Visitor, , 87,000 mi

    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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  • Visitor, , 146,000 mi

    Traveling to FL from GA my check engine light came on. Got it tested and found out it's my catalytic converter, on the front right side. $800 to replace! Trying to find the part cheaper somewhere else but since there's 2 converters on this car I don't know.

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