Car Problem Reports

Nissan Altima Rattle/CEL Due to Cracked Welds on Catalytic Converter Heat Shield

Nissan Altima Problem
25 Reports
Me Too

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

Exhaust & Emissions Affected: 3.5L V6

Average Mileage: 71,400 mi (30,000 mi - 178,000 mi)


Welds on the catalytic converter heat shield can corrode causing a rattle during acceleration and possibly causing Check Engine Light illumination. The common repair for this issue is replacement of the damaged catalytic converter.

  • Visitor, , 40,100 mi

    The heat shield welds came loose on catalytic converter which was causing a loud noise. Had it fixed for under $100.

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  • Visitor, , 120,000 mi

    The car would have a rattle sound once i started it and when driving at slow sppeds, especailly when first driving off.

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  • Visitor, , 53,000 mi

    rattling noise when accelerating .. typically between 1500 and 2000 rpm. Dealership wants $875 to replace the exhaust manifold --- this is my third Nissan in 5 years ... I had a Rogue for 6 months when the transmission fell out and I somehow let them talk me into another Altima. No more Nissans for me. :(

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  • cuna, , 70,656 mi

    rattle noise coming from the engine during acceleration.

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  • Visitor, , 47,654 mi

    Same problem, welds on the heat shield for catalytic converter came off causing rattle from 1500 rpm - 1700rpm and low idle. Had local shop weld back on. Fixed problem.

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  • ravenb, , 178,000 mi

    Multiple misfires cam a n b altima knock sensor diagnosis

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  • Visitor, , 63,000 mi

    Had to replace the entire catalytic converter for $800 including parts and labor.

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  • Visitor, , 66,000 mi

    Have a rattle upon first starting my Altima. Goes away after it warms up a bit. Haven't fixed it yet but looking for a solution

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  • Visitor, , 36,000 mi

    warrenty fix

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  • Visitor, , 57,000 mi

    Rattling noise at low speeds, usually early in the morning. Diagnosed as a heat shield problem and fixed for pretty cheap.

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