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My 2005 4-cylinder 2.5s Nissan Altima has been having major issues for the past several months. My mechanic replaced the catalytic converter and a month later another mechanic said that the catalytic converter is completely disintegrated. Apparently the initial problem was with the ignition coils and that has been causing the problems with the catalytic converter. How are these two related?

user19864
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Cats don't really like exposure to fuel. If your car has bad coils resulting in unburnt fuel, this can ruin a cat, hence how they are related.

Steve Oakes
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