Pre-Cat Oxygen Sensor, Bosch - 550i/650i/750i, X5/X6 50i, X5M/X6M
OEM O2 sensor to keep your emissions system running smoothly. Direct replacement for BMW part #11787576673. N63A, N63TU
This part is listed by BMW as BMW part number 11787576673 (11 78 7 576 673) and is described as Oxygen Sensor for the BMW N63 and S63 twin-turbo V8 engines, as found on the F10 M5, 550i, F12/F13/F06 650i, X5 50i, X6 50i, F01/F02 750Li and Alpina B7, E70 X5 M, E71 X6 M, F85 X5 M, F86 X6 M, and others.
The pre-cat O2 sensors, also known as Lambda probes, on the F10, F13, F02, X5, and X6 are some of the most important sensors on the N63 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. Each bank of cylinders has its own sensor before and after the catalytic converters (this part number is the same sensor for both banks). The ECU adjusts fuel injection based on the data so the sensors also affect fuel economy in addition to performance. An integrated heater circuit helps prolong the life of the sensor but can also fail and give a check engine light.
Signs of an O2 sensor failure include worse fuel economy, lack of torque, and fault codes for the sensor(s). It is a good idea to replace the O2 sensors at regular intervals rather than waiting for a failure. Since their performance degrades over time you may not even notice the loss in performance or economy. Since the complete O2 sensor is part of the emissions system, a bad sensor may not set multiple OBD Readiness flags.
For full BMW fitment information or for assistance from one of our BMW experts, we recommend calling us at 877-639-9648.
F10 / F11 (11-16) > 550i
F10 / F11 (11-16) > 550i xDrive
F10 / F11 (11-16) > M5 (2013-2016)
F12 / F13 (12-18) > 650i
F12 / F13 (12-18) > 650i xDrive
F12 / F13 (12-18) > M6
F01 / F02 (2009-2015) > 750i
F01 / F02 (2009-2015) > 750Li
F01 / F02 (2009-2015) > 750Li xDrive
E70 X5 (07-13) > X5 M
E70 X5 (07-13) > X5 xDrive50i
F15 X5 (2014+) > X5 xDrive50i
F85 X5 M (2015+) > X5 M
E71 X6 (08-14) > X6 M
E71 X6 (08-14) > X6 xDrive50i
F16 X6 (2014+) > X6 xDrive50i
F86 X6 M (2015+) > X6 M