I don't understand what's going on. I replaced the upstream 2x already. Took old one in saying the had a manufacturer defect got 2 new ones. Got a new maf. I cleaned battery post, grounds redid my wiring. Clean air filter, fixed exhaust leaks. New spark plugs gapped to .52... I don't understand what's going on.
My car says it is federal emissions but the car is rigged for California. And I only have 2 sensors not three. 2006 Mazda 3 2.3 manual.. has anyone has this issue before?
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