Mazda3 CX-7 2007-2012 Air-Fuel Ratio Oxygen Sensor L33L-18-8G1B Original Standard

This air-fuel ratio oxygen sensor is designed for 2007-2012 Mazda3 (2.0L/2.3L) and 2007-2012 Mazda CX-7 (2.3L turbo); directly replaces original parts to ensure accurate monitoring of air-fuel ratio, improving fuel economy and emissions. OEM: L33L-18-8G1B (corresponding to L33L188G1B, L33L188G1B9U) for cross-checking with stock numbers. Replacement difficulty is medium; use dedicated oxygen sensor socket to avoid thread damage; clean exhaust interface and apply anti-coupling agent before installation. As an OEM-standard replacement, no programming required, suitable for bulk stock, especially to address P0171/P0174 codes on high-mileage Mazda3 and CX-7.