Where is the rear motor position sensor located on the BMW 740?
3 Answers
First locate the starter, which is positioned below the throttle body. Then find the intake manifold - the starter motor is situated beneath the intake manifold. Here's relevant information: 1. Starter motor: The starter motor is a tool that provides power to the engine with simple operation. It's a device that converts electrical energy into mechanical energy to power the vehicle. When the starter fails to rotate, it may be due to either a dead battery unable to supply power or poor circuit contact inside the starter preventing energy transmission. 2. Precautions: If the starter motor malfunctions, it may also cause the starter to operate abnormally, indicating poor circuit connections that require inspection of battery terminals. Failure to rotate can result in non-functional car horns, leaving the vehicle unable to sound warnings during emergencies. For routine starter maintenance, regularly lubricate bearings with oil to ensure smoother rotation.
Regarding the rear motor position sensor on the BMW 740, based on my extensive experience in BMW repairs, it is often integrated into the rear axle active stability system or the differential unit. It is typically installed at the top of the right rear suspension arm or on the side of the motor housing, and the exact location requires removing the wheel cover to be visible. During installation, extra care is needed as the sensor wiring is connected to the chassis ECU. Misplacement can lead to incorrect suspension height judgments or unstable power output. I’ve dealt with similar issues before—dust contamination or displacement of the sensor can trigger adaptive lighting warnings or cause uneven driving. BMW designed this component to be impact-resistant, hence its concealed placement. It’s advisable to use a diagnostic tool to read fault codes for accurate location. Before attempting repairs, consulting the user manual or a specialized repair shop is recommended to avoid damaging the circuitry through improper handling.
As a BMW 740 owner, I remember last time I checked this sensor was located at the rear of the undercarriage. It's installed near the rear axle motor on the axle side, seemingly on a bracket next to the shock absorber. The sensor is a small component used to detect motor position. If it fails, the car may produce abnormal noises during startup or the traction control light may illuminate. That time, I used a flashlight to look under the car and found the location quite tricky to access—you'd need a lift to get a clear view. I recommend first checking if the sensor wiring is securely connected; if oxidized, spray some rust remover. During routine maintenance, have the technician take a quick look to prevent issues—don't wait until it breaks to fix it, as that'll cost more.
