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: 88,563 (30,000–199,706)
Exhaust & Emissions affected: 3.5L V6
12 model years affected: 2002, 2003, 2004, 2005, more2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013
47 people reported this problem
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problem details
2009 Nissan Altima 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.
2007 Nissan Altima 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
2012 Nissan Altima 70,000 mi,
rattling noise when starting and accelerating
2012 Nissan Altima 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. :(
2012 Nissan Altima 30,000 mi,
I had same issue, and still covered under warranty, thank goodness
2007 Nissan Altima 40,100 mi,
The heat shield welds came loose on catalytic converter which was causing a loud noise. Had it fixed for under $100.
rattle noise coming from the engine during acceleration.
2005 Nissan Altima 86,000 mi,
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?
2012 Nissan Altima 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.
2007 Nissan Altima 178,000 mi,
I have the rattling that comes from under the car (not the engine) and my check engine lights comes on and off. The rattle stops once I hit 40 miles per hour.
2006 Nissan Altima 57,000 mi,
Rattling noise at low speeds, usually early in the morning. Diagnosed as a heat shield problem and fixed for pretty cheap.
2008 Nissan Altima 30,000 mi,
Rattle occurs on engine start. Typically occurs on a cold engine.
2012 Nissan Altima 40,000 mi,
Catalytic converter heat shied got rusted and broke. I heard a sound from engine compartment at around 1500 rpm. Got it covered under warranty
2008 Nissan Altima 63,000 mi,
Had to replace the entire catalytic converter for $800 including parts and labor.
2012 Nissan Altima 75,000 mi,
Rattling noise starting car and driving .
2010 Nissan Altima 154,400 mi,
I have noticed that my car makes this rattle noise sometimes when I press on the accelerator. I just recently replaced my exhaust manifold/catalytic converter and front 02 sensor, but I still hear the noise at times.
2005 Nissan Altima 164,000 mi,
My 2005 Nissan Altima started displaying the "check engine light and there is also an intermittent rattling noise or shaking that is heard at the front.
2006 Nissan Altima 102,000 mi,
Ratting noise in front exhaust system .starting off very loud rattling noise and while cracking up
2012 Nissan Altima 49,505 mi,
rattling on acceleration/deceleration between 1200 and 1700 RPMs
Multiple misfires cam a n b altima knock sensor diagnosis