BMW X1 Front Oxygen Sensor 0258017099/1178755807 Emission Control Precise Matching

When your BMW X1’s engine malfunction light is on, idle is unstable, fuel consumption rises significantly, or there is a stronger odor from the exhaust, this usually means the pre-cat oxygen sensor has aged or failed and can no longer accurately monitor the oxygen content in the exhaust. When functioning normally, this sensor feeds real-time Lambda (air-fuel ratio) signals to the ECU to help the engine precisely control fuel injection, ensuring combustion efficiency and compliant emissions. This product OEM number is 0258017099/1178755807, compatible with BMW X1 (E84/F48 series) and some models with N20/B48 engines. During installation, be sure to use a dedicated socket tool, avoid over-tightening and thread damage, and ensure the sensor harness does not contact the exhaust pipe or moving parts to prevent heat or abrasion damage.