Ford Oxygen Sensor 0258006927/6G91-9G444-AA 30650780 Fast heating shortens cold start

This oxygen sensor is designed for Ford Focus (2005-2011, 1.8L/2.0L), Mondeo (2007-2010, 2.0L/2.3L), and Mazda3 (2006-2012, 2.0L). It uses rapid heating technology to shorten the time to enter closed-loop after cold start, improving fuel economy and reducing emissions. OEM numbers 0258006927, 6G91-9G444-AA, and 30650780 for cross-referencing with original parts. Replacement difficulty is medium; it is recommended to use a dedicated oxygen sensor socket to avoid thread damage. Apply anti-seizing compound before installation to extend life. This sensor is a four-wire standard type, compatible with most OBD II systems; bulk purchases can reduce repair shop inventory costs.