BMW 11787545075 Rear Oxygen Sensor

To unbolt pre-catalyst oxygen sensors on the N52 engine, one requires a 22mm crow-foot wrench and knows that M54 engine is almost the same. Start with the removal of the engine covers and numbering the connectors of the harness oxygen sensors while on the top of the engine. On right side of the car, above the exhaust manifolds, there are two Torx bolts which hold the bracket onto the exhaust manifold: remove them and pull the bracket off. For installation reverse the removal process, if there is no anti-seize compound on the threads of the sensor apply little of it, and check the connector of the sensor electrical harness.