Mazda CX-3 2WD
Observed 2016–2021 (US EPA) · observed model years, not a production range
- CX-3 Rear O2 monitor: 0 completions in 36 encounters since battery swap. Anyone else?
Mazdas247 · geepytee · 31 Oct 2026
2016 CX-3 Grand Touring AWD, 2.0 SKYACTIV-G, ~103,800 miles. Original O2 sensors, no exhaust work ever, no PCM reflash in its history. It passed California smog in June 2026 on this same sensor and calibration. Oct 6 the battery was replaced and readiness wiped. Since then every monitor has completed EXCEPT the oxygen sensor monitor. No DTCs at any point — none stored, none pending. What the data shows: - In-use performance tracking: SO2S encounters 36, SO2S completions 0. Ignition cycles... Read more
- Has anyone replaced a CX-3 Rectangular Centre Air Vent?
Mazdas247 · NASTY1 · 15 Oct 2026
Hi everyone, I’m looking to replace the rectangular air vent next to the hazard button on my 2017 CX-3, shown in the photo. Mine is an Australian right-hand-drive model. Has anyone replaced this themselves? Is it a fairly straightforward DIY job, and what trim needs to come off to access the screws or clips? Also, any recommendations on where to source the replacement, new or used? The correct part number would be helpful too. Any tips, photos or links to a guide/video would be much... Read more