BMW E9X 3-Series Pre Cat O2 Sensor / Oxygen Sensor OEM

Bosch is the world's leading supplier and original equipment manufacturer of Oxygen Sensors. Bosch invented the automotive oxygen sensor and leads the way in sensor technology and innovation. From overall sensor design to the critical ceramic element, Bosch is known worldwide for quality and performance.

BMW Oxygen Sensor - Bosch 17039

Genuine Bosch O2 sensor to keep your emissions system running smoothly. OEM replacement for BMW part #13627801158

Pre-Cat Oxygen Sensor, Bosch - E90 335d, F10 535d, E70 X5 35d, F15 X5 35d

F06 oxygen sensor diy

E46 325i M56 SULEV bank 1 pre-cat O2 sensor (cylinders 1-3, before the catalytic converter). The pre-cat O2 sensors, also known as Lambda probes, on the E46 325i are some of the most important sensors on the M56 engine. The pre-cat sensors tell the engine computer how well the engine is working (note: not how clean it is, that's the post-cat sensor). The pre-cat sensors give the ECU feedback on the engine tuning - if it's running lean or rich - and the ECU makes adjustments based on their data.