Question about 1999 Chevrolet Silverado 1500
I have a 99 silverado1500 4.8L and im getting codes P0420 and P0430? i was told it was my o2 that needed to be replaced, but theres 4 of um 2 (pre&post)on each side. how do i know if im replacing the rite one?
Codes p0420 and p0430 are both post o2 sensors, the ones after the convertor, both sides if replacing
Posted on May 18, 2009
I replace all three o2 sensor and still get p0420
Posted on Jun 24, 2010
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Posted on Jan 02, 2017
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