Question about 2003 Chevrolet Malibu
Hi. P0420 is a catalyst efficiency code. 100% of the time you need a new catalytic converter. If you want to be sure it is the cat pull the O2 sensor before the cat and drive it, the sluggishness will go away because there is no more restriction.
Posted on Aug 26, 2010
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Posted on Jan 02, 2017
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