Ford Oxygen Sensor CN1A-9G444-AA Replaces BL3A-9G444-CA

This oxygen sensor is designed for Ford Focus (2012-2018, 1.6L/2.0L), Escape (2013-2019, 1.5T/2.0T), and Mondeo (2011-2016, 2.0T), and also compatible with Mazda CX-5 (2013-2016, 2.0L/2.5L) on certain versions. Core function is real-time monitoring of exhaust oxygen content and feeding the ECU to adjust the air–fuel ratio for efficient combustion and reduced emissions. OEM number CN1A-9G444-AA, directly replaceable with original BL3A-9G444-CA. Before replacement, check old resistance with a multimeter. Installation difficulty is medium; use a dedicated oxygen sensor socket, avoid getting oil on the threads, and consider anti-galling lubricant. Manufactured to KLP OEM standards, effectively resolves idle instability, rising fuel consumption, and check-engine lights; suitable for bulk purchase for repair shops.