Ford Fiesta Rear Oxygen Sensor AE81-9G444-BCA OZA658-D3 Precision Match

This replacement uses Ford OEM-consistent ceramic sensing element and high-temperature alloy housing; accuracy in tailpipe detection and resistance to heat degradation exceed 90% of original parts, suitable as a cost-effective replacement. OEM numbers AE81-9G444-BCA and OZA658-D3; precisely fits Ford Fiesta 1.5L/1.6L (2013-2018). Function: monitor exhaust oxygen content and feed ECU to adjust air-fuel ratio; failure increases fuel consumption and triggers the emission light. Installation difficulty: medium; lift the vehicle and remove exhaust pipe sections; use a dedicated socket to avoid thread damage.