Oxygen Sensor for Mazda 3 BK 1.6L 2.0L 2.3L 20032009 Compatibility Fits Mazda 3 BK models with 1.6L, 2.0L or 2.3L engines from 2003 to 2009 Materials and build Airfuel ratio oxygen sensor with ABS and copper design for durability Installation Direct replacement of the original sensor Plugandplay installation; no wiring modifications needed Function and performance Senses exhaust oxygen to help control the airfuel ratio Accurate and sensor designed to support efficient engine operation Key benefits Improves fuel economy Reduces harmful emissions Supports the engine running with the correct airfuel balance Use scenarios Routine maintenance on a Mazda 3 BK to a aging oxygen sensor and restore fuel efficiency Diagnostics or when engine performance or emissions issues point to the oxygen sensor Regular replacement in a maintenance cycle to maintain efficiency and emission performance Notes Maintains compatibility with Mazda 3 BK 1.6L, 2.0L, and 2.3L engines from 20032009 Designed for durability and reliable operation within its stated application