Overview
The ZF 0501.209.506 SPEED SENSOR is a critical electronic component that monitors rotational speed within the transmission assembly. Positioned directly on the valve body or housing of ZF WG-series transmissions, this OEM genuine part converts mechanical rotation into an electrical signal for the control unit. The SKU 0501.209.506 ensures precise data transmission to optimize shift timing and torque converter lockup. Without accurate speed input from this sensor, the transmission control module cannot maintain proper gear engagement or pressure regulation.
Symptoms of Failure
- Erratic shifting or gear hunting – When the sensor fails, the transmission may struggle to find the correct gear, especially under load or during hill climbs.
- Intermittent loss of speedometer signal – A worn 0501.209.506 often causes the vehicle speed display to drop to zero or fluctuate randomly while driving.
- Harsh engagement or delayed upshifts – Faulty speed data forces the control unit to use default parameters, resulting in jarring shifts or prolonged hesitation between gears.
- Transmission enters limp mode – Persistent sensor errors trigger a safety protocol, limiting the transmission to a single gear to prevent internal damage.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.209.506 |
| Type | Inductive Speed Sensor |
| Housing Material | Reinforced Thermoplastic / Steel |
| Weight | 0.12 kg (0.26 lbs) |
| Thread Size | M18 x 1.5 |
| Output Signal | Sine Wave (Variable Reluctance) |
| OEM Reference | ZF 0501.209.506 |
| Operating Temperature | -40°C to +150°C |
Compatibility
This speed sensor is engineered for the ZF WG100, WG130, and WG131 transmission series. It also fits select WG180 and WG200 variants when used with the correct 2095101022: TRANSMISSION HOUSING or 2095301025: TRANSMISSION HOUSING. Always verify the mounting depth and connector type against your specific transmission model. For proper sealing during installation, use a new 0634304731: O-RING and ensure the 4475280150: SCREW PLUG is torqued to specification to prevent fluid leaks.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2095101022 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 2095301025 | TRANSMISSION HOUSING | Alternate housing variant for WG series |
| 4475280150 | SCREW PLUG | Seals sensor bore against fluid loss |
| 0634304731 | O-RING | Provides leak-proof seal for sensor mount |
| 0636011207 | HEXAGON SCREW | Fastens sensor bracket to housing |
| 0636011188 | HEXAGON SCREW | Secures control unit mounting plate |
| 0730365280 | TYPE PLATE | Identification label for transmission model |
| 0501337897 | SPEED SENSOR | Alternate sensor variant for older WG units |
| 0636101027 | CAP SCREW | Closes unused sensor ports |
| 0631306155 | CYLINDRICAL PIN | Aligns sensor during installation |
