Join Date: Jul 2011
Location: Southern New Hampshire
Some times the upstream O2 sensor gets lazy. If you opt to replace it, do NOT buy a Bosch unit; they do not play nice with numerous manufacturers; instead, buy either an OEM Mazda sensor or one from Denso.
2006 Acura TL 6-Speed Manual
2016 Mazda3 s GT 5-Door 6-Speed Manual