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Thanks. I can get a 3/4 inch socket wrench adapter for this for 14.99 so may just do that. One last dumb question. bank 1 sensor 1 is the one located at the back of the engine near the cockpit, vetrically kind of below the dipstick on the 2.0 correct? Previously only really worked on my old...

Thanks. Wasn't likely gonna do oem. We only use this for commuting mostly now (big fam). A little pricier in Canada but rockauto may help. Would I need to do downstream sensor too, or just the upstream? Hope I didn't damage the catalytic converter 😥

Hi all , have a 2011 2.0 Mazda 3 auto with 160000km. Mostly highway use moderately agressive driving. FWIW Haven't changed oil in too long but the volume of oil is good. No previous issues save damaging ABS during a suspension swap a year ago TBH have never fixed it but, no performance issues...