Rattle and/or Check Engine Light Due to Cracked Welds on Catalytic Converter Heat Shield on Nissan Altima

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.

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Average mileage: 67,519 (30,000–178,000)
Exhaust & Emissions affected: 3.5L V6
11 model years affected: 2002, 2003, 2004, 2005, more2006, 2007, 2008, 2009, 2010, 2011, 2012
34 people reported this problem
16 people shared problem details
2009 Nissan Altima120,000
The car would have a rattle sound once i started it and when driving at slow sppeds, especailly when first driving off.
4 people like thisFlag inappropiate
2007 Nissan Altima40,100
The heat shield welds came loose on catalytic converter which was causing a loud noise. Had it fixed for under $100.
4 people like thisFlag inappropiate
2012 Nissan Altima47,654
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.
3 people like thisFlag inappropiate
2012 Nissan Altima30,000
I had same issue, and still covered under warranty, thank goodness
2 people like thisFlag inappropiate
2012 Nissan Altima53,000
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. :(
2 people like thisFlag inappropiate
2005 Nissan Altima86,000
Same rattle noise while driving, In 2006 took my car in for same noise and had the Cat replaced. Now 9 years later doing it again. Is this a recall?
1 person likes thisFlag inappropiate
rattle noise coming from the engine during acceleration.
1 person likes thisFlag inappropiate
2012 Nissan Altima40,000
Catalytic converter heat shied got rusted and broke. I heard a sound from engine compartment at around 1500 rpm. Got it covered under warranty
2012 Nissan Altima49,505
rattling on acceleration/deceleration between 1200 and 1700 RPMs
2012 Nissan Altima70,000
rattling noise when starting and accelerating
Multiple misfires cam a n b altima knock sensor diagnosis
2008 Nissan Altima63,000
Had to replace the entire catalytic converter for $800 including parts and labor.
2007 Nissan Altima66,000
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
2007 Nissan Altima36,000
warrenty fix
2006 Nissan Altima57,000
Rattling noise at low speeds, usually early in the morning. Diagnosed as a heat shield problem and fixed for pretty cheap.
2008 Nissan Altima30,000
Rattle occurs on engine start. Typically occurs on a cold engine.

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