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You have to look at what caused the rotten egg smell..the number one culprit usually is bad gas..or gas that is not of the proper octane rating..ever see those brand new mercedes and stuff that drive past you and smell like rotten eggs because they are running regualar instead of premium?
Happens way to often.
And if the cat is completly shot..just replacing the 02 wont help, youll have to replace the cat aswell..
why did you replace it the first time..a few weeks ago, and was the problem there before the new cat?
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