Car Problem Reports

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

Nissan Altima Problem
167 Reports
Me Too

Model Years Affected: 1999, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012

Exhaust & Emissions Affected: 2.5L 4 Cylinder

Average Mileage: 126,659 mi (11,800 mi - 260,000 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.

  • , , 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

    Flag This
  • , , 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

    Flag This
  • , , 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

    Flag This
  •  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!

    Flag This
  • , , 123,500 mi

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

    Flag This
  • , , 126,000 mi

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

    Flag This
  • , , 108,000 mi

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

    Flag This
  • 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.

    Flag This
  • , , 174,000 mi

    Check engine light went on. I took the car for a code check and it came up with the code in this article

    Flag This
  • , , 166,000 mi

    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.

    Flag This
+ See more reports
Ask a Question