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2001 Nissan Sentra Question: how can you tell if the rear catalytic converter needs replacing?



Visitor, 1.8L 4 Cylinder, Louisa, VA, March 07, 2010, 11:32

mechanic used computer to scan check engine light problem - said I needed rear catalytic con, which cost me $400 for part and isntallation. Truth is, I needed a new engine as I had cracked head or blown head gasket - due to bad gas. I did not need rear cat con, why did code read that way?

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  • Answer #1

    March 07, 2010, 11:43

    Your defective head gasket poured out way too much pollution and over worked the CAT. This is common. You most likely had a P0420 code. Check out this article I wrote about this code, it may help shed some light.


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