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P0420 below catalist eficient

136 Views 1 Reply 2 Participants Last post by  Spade1952
Cualquiera que haya tenido este problema antes, por favor ayuda. El sensor es nuevo y eso me sorprende.
Anyone who has had this problem before please help. The sensor is new and that surprises me
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Have you had the cat converter ever changed to generic brand? If so won't make any difference how many new o2 sensors, you put in.
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