Car Problem Reports

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

Nissan Sentra Problem
36 Reports
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Model Years Affected: 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010

Exhaust & Emissions Affected: 2.5L 4 Cylinder

Average Mileage: 120,550 mi (59,645 mi - 185,331 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, , 141,000 mi

    Check engine light, loud knocking - told it was a bad cat

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  • Visitor, , 119,500 mi

    Had a fuel system cleaning done which set the check engine light off. Turned out to be the front catalytic converter for precisely the reason stated. Fixed through replacement.

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  • Visitor, , 91,860 mi

    Took my vehicle in for service. I had the coolant line flushed and fuel line flushed and diagnostic code check. The service engine soon light was on when I took it in and then the mechanic reset it. He told me the diagnostic code was a result of the catalytic converter going bad. Well, the light just came back on.

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  • Visitor, , 125,000 mi

    Check engine light came on and my mechanic reset the codes and advised me to pump premium gas for the new few fills. Did so and the check engine light stayed off for 6 months. Now its back and he is advising me about a bad cat and that I need to replace it for $850. He reset the codes and advised me to replace it the next time the check engine light comes on.

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  • Visitor, , 62,572 mi

    3rd cylinder bad. Had to have entire engine replaced. Nissan refused any help because it was out if warranty at 60,000.

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  • Visitor, , 59,645 mi

    Code p 420 service engine soon

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  • Visitor, , 114,500 mi

    Intermittent check engine light. Dealer and alt repair shop advised bad cat. Took to a third shop for full breakdown of exhaust system and found cat split at the welds. Mechanic quote, "Robot did not have its coffee that day". Replaced at cost of 983.00. Core sent back to Nissan or would be charged another 140.00.

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  • Visitor, , 145,350 mi

    I am about to go on a 2,000 mile road trip and this is come on. I passed emissions today but gave the the Catalytic Converter error message. I am getting checked out tomorrow by the dealership and I hope I do not have to replace anything.

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  • Visitor, , 114,000 mi

    Nissan senta 2000 po171 bank 1leak

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  • Visitor, , 110,000 mi

    Catalytic Converter failure

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