Mazda2 Fiesta Rear Oxygen Sensor ZJ37-188G1A Universal Replacement Original Fitment

When your Mazda 2 or Ford Fiesta shows engine warning light, noticeably higher fuel consumption, idle instability, or exhaust odor, rear oxygen sensor aging or failure is likely, unable to accurately monitor exhaust oxygen content. It real-time feeds air–fuel ratio data to ECU to help maintain optimal combustion efficiency, reducing emissions and improving throttle response. OEM ZJ37-188G1A; fits Mazda 2 (2007–2014) and Ford Fiesta (2008–2015); direct OEM replacement. Install with clean sensor threads and apply anti-seize; avoid over-tightening and ensure wiring harness location away from exhaust heat.