Question about 2001 Buick LeSabre
Po420 = catyalic converter low efficency, this means the converter is not working good, this can be caused by a bad converter or bad o2 sensors, you will need to have a scan tool hooked to computer and preform testing to see if it is the converter or bad o2 (oxygen sensor) sensors. hope this helps.
Posted on Aug 31, 2010
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Posted on Jan 02, 2017
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