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2003 Chevrolet Malibu

 

Question: I have replaced both o2 sensors and the car ran fine for about 3000 miles.

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lciniglio, Montgomery, AL, November 07, 2011, 11:55
 Rookie

the check engine light is now on with an error code 420, what causes this.

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  • Answer #1

    raiderron November 07, 2011, 19:51
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     Master

    Catalytic efficiency code. I have run across this before with my wife's Trans Am. Replaced O'2's and was good for a bit but still had to replace the cat convertor.

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