BMW E38 7-Series Pre-Cat O2 Oxygen Sensor OEM 11781247406 (1996-08/1998)

Restore accurate engine management with this Bosch OEM pre-catalytic oxygen sensor for the BMW E38 7-Series. Also called an upstream O2 sensor or lambda sensor, this component monitors the oxygen level in the exhaust before it reaches the catalytic converter. The engine control unit uses this information to adjust the air-fuel mixture and support smooth, efficient operation. Sold each.

This BMW oxygen sensor carries OEM part number 11 78 1 247 406, also listed as 11781247406. Bosch manufactures the sensor to original equipment standards for dependable fit, signal accuracy, and long-term performance. It provides a direct replacement solution for a worn, contaminated, or failed pre-cat sensor.

• Genuine Bosch OEM-quality construction for reliable oxygen measurement.
• Pre-catalytic, upstream design helps the engine maintain the correct fuel mixture.
• Designed for selected BMW E38 7-Series applications built from 1996 through August 1998.
• Helps address symptoms linked to a faulty O2 sensor, including poor fuel economy, rough running, or an illuminated check engine light.

Important fitment note: This sensor fits only compatible BMW E38 7-Series models produced between 1996 and 08/1998. Vehicle fitment can vary by engine, production date, and emissions configuration. Check the original sensor, vehicle build date, and part number before ordering. This is the pre-cat sensor located before the catalytic converter; it is not the post-cat or downstream oxygen sensor.

Replacing a degraded upstream oxygen sensor can help restore proper fuel-trim control and maintain the intended performance of your BMW. Professional installation is recommended, especially when removing a sensor from an older exhaust system. Clear any stored fault codes after installation and verify correct operation with a diagnostic scan tool.