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2002 Toyota Camry Question: how to check 02 sensors



, 2.4L 4 Cylinder, Bronx, NY, June 15, 2010, 08:49

replaced lower 02 sensor and cleared codes and after 50 mles ck engine light returned. I've been told its a catalytic converter but want to eliminate smaller possibilities before confronting the cat issue

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  • Answer #1

    June 15, 2010, 08:54

    the 420 code is cat effeiency. rarely is the o2 bad. not much else to check.replace with california approved or light will return. most aftermarkets do not meet oem specs and will turn the light on.


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    , June 15, 2010, 18:03

    Thanks Roy I'll be sure to verify the exact code. Can you tell me whats the engine code for a bad purge control valve?

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