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: 73,436 (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
39 people reported this problem
18 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.
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. :(
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.
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.
rattle noise coming from the engine during acceleration.
2012 Nissan Altima30,000
I had same issue, and still covered under warranty, thank goodness
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?
2012 Nissan Altima70,000
rattling noise when starting and accelerating
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
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.
2007 Nissan Altima178,000
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 Altima102,000
Ratting noise in front exhaust system .starting off very loud rattling noise and while cracking up
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
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.
2008 Nissan Altima30,000
Rattle occurs on engine start. Typically occurs on a cold engine.

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