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

Problem Description and Possible Solution

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.

Problem Data
RepairPal Verified
Average mileage: 89,121 (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
50 people reported this problem
Viewing 1 - 20 of 21 comments
The car would have a rattle sound once i started it and when driving at slow sppeds, especailly when first driving off.
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
rattling noise when starting and accelerating
rattle noise coming from the engine during acceleration.
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?
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. :(
The heat shield welds came loose on catalytic converter which was causing a loud noise. Had it fixed for under $100.
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.
I had same issue, and still covered under warranty, thank goodness
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 occurs on engine start. Typically occurs on a cold engine.
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.
Rattling noise at low speeds, usually early in the morning. Diagnosed as a heat shield problem and fixed for pretty cheap.
Had to replace the entire catalytic converter for $800 including parts and labor.
Catalytic converter heat shied got rusted and broke. I heard a sound from engine compartment at around 1500 rpm. Got it covered under warranty
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.
warrenty fix
Rattle@ idle around 1600rpm..ratlle @ exhaust tube on the aft heat shield closer too engine side, connected to catalytic converter.broken weld where bolt is attached to converter bolt flange hole.
Ratting noise in front exhaust system .starting off very loud rattling noise and while cracking up
rattling on acceleration/deceleration between 1200 and 1700 RPMs