Overview
The ZF 4646.125.013 INDUCTIVE SENSOR is a precision electronic component engineered for the WG250 transmission series. This OEM genuine part monitors rotational speed and position of the turbine shaft within the transmission housing, converting mechanical motion into electrical signals for the control unit. Installed directly into the TRANSMISSION HOUSING, the sensor ensures accurate data feedback for shift timing and clutch engagement. The SKU 4646.125.013 is a direct replacement for the original factory sensor, maintaining the exact calibration and signal integrity required for optimal transmission performance.
Symptoms of Failure
- Erratic gear shifting or delayed engagement – A failing inductive sensor sends inconsistent speed signals, causing the transmission control module to misjudge shift points. This often results in harsh or delayed shifts, especially when accelerating from a stop.
- Transmission slipping under load – When the sensor cannot detect turbine speed accurately, the transmission may slip between gears, particularly during uphill driving or heavy towing. This symptom often appears alongside a check engine light.
- Intermittent limp mode activation – The control unit may trigger a fail-safe mode if the sensor signal drops out entirely. Drivers notice reduced power and a locked gear, requiring a restart to clear the condition.
- No start or crank-no-start condition – In severe cases, a completely failed sensor prevents the transmission from communicating with the engine control module, leading to a no-start scenario that mimics a dead battery or starter issue.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4646.125.013 |
| Type | Inductive Proximity Sensor |
| Operating Voltage | 10–30 V DC |
| Output Signal | Frequency (Pulse Train) |
| Housing Material | Stainless Steel / Thermoplastic |
| Thread Size | M12 x 1.5 |
| Overall Length | 55 mm |
| Weight | 0.045 kg |
| OEM Reference | ZF 4646.125.013 |
| Sealing | IP67 Rated |
Compatibility
This inductive sensor is primarily designed for the ZF WG250 series, but it also fits the WG180, WG200, and WG240 models due to shared sensor mounting points in the HOUSING assembly. The sensor is compatible with all WG250 variants produced after 2005, including the WG250-6 and WG250-8. For proper installation, ensure the COVER is removed to access the sensor port, and use a HEXAGON SCREW to secure the sensor bracket. Always verify the sensor gap (0.8–1.2 mm) during installation to prevent signal loss.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101029 | TRANSMISSION HOUSING | Main structural casing for gear assembly |
| 4646301090 | HOUSING | Secondary housing for sensor and valve body |
| 4646301087 | COVER | Protective cover for sensor access port |
| 0636015304 | HEXAGON SCREW | Fastener for sensor bracket mounting |
| 0636101828 | CAP SCREW | Secures housing cover plate |
| 4646301102 | COVER SHEET | Thin gasket for sealing cover joints |
| 4646301235 | COVER SHEET | Alternate gasket for different housing variants |
| 0730365067 | TYPE PLATE | Identification label for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for housing assembly |
| 0636101193 | CAP SCREW | Fastener for valve body attachment |
