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david craig
david craig, Auto Mechanic
Category: BMW
Satisfied Customers: 3608
Experience:  owner/mechanic at 3D Automotive
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BMW 745li With P0500 and P1721 Error Codes.

Customer Question

2003 BMW 745li has codes P0500 : Vehicle speed sensor and code P1721.
I am also getting a parking brake malfunction - 'brake/drive fault, drive moderately' and power steering is really hard.
What to do about these errors?
Submitted: 11 months ago.
Category: BMW
Expert:  david craig replied 11 months ago.
Hi Im David, thanks for visiting the site.
P1721 - Gear 1 Incorrect Ratio
Possible causes - Faulty Vehicle Speed Sensor - Vehicle Speed Sensor harness is open or shorted - Vehicle Speed Sensor circuit poor electrical connection - Transmission Control Module (TCM) communication.
The vehicle speed sensor· MTR signal is transmitted from combination meter to Transmission Control Module (TCM) by CAN communication line. The signal functions as an auxiliary device to the revolution sensor when it is malfunctioning. The TCM will then use the vehicle speed sensor· MTR signal, replace the vehicle speed sensor.
P0500 BMW - Vehicle Speed Sensor Signal Error. Replace the vehicle speed sensor and you will be good to go.
Customer: replied 11 months ago.
Thanks for your help,
Where is the sensor located?
Is the powers steering also part of the sensor?
Expert:  david craig replied 11 months ago.

no. i will send you a diagram in a bit,thanks

Customer: replied 11 months ago.
Ok, thank you!