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

 

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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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    March 07, 2010, 11:43
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     Master

    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.

    http://repairpal.com/OBD-II-Code-P0420

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