Overview
The ZF 4651.125.001 INDUCTIVE SENSOR is a critical electronic component engineered for the WG 100 series transmission family. This OEM genuine part monitors rotational speed and position of internal shafts, sending precise signals to the transmission control unit (TCU) to ensure optimal shift timing and clutch engagement. Positioned directly within the valve body or housing assembly, the sensor interfaces with the TRANSMISSION HOUSING to detect ferrous targets without physical contact. The SKU 4651.125.001 is a direct replacement for original equipment, guaranteeing factory-specified clearance and signal integrity.
Symptoms of Failure
- Erratic or delayed shifting: A failing inductive sensor sends intermittent or false speed data, causing the TCU to miscalculate shift points. This often manifests as harsh engagement or hesitation between gears.
- Transmission stuck in limp mode: When the sensor loses signal entirely, the system defaults to a safe mode, locking the transmission in a single gear (usually 2nd or 3rd) to prevent damage.
- Intermittent loss of reverse gear: Faulty speed sensing can confuse the TCU during reverse engagement, leading to a delayed or completely absent reverse operation.
- Check engine or transmission warning light: The ECU logs diagnostic trouble codes (DTCs) related to input/output speed sensor circuit faults, often accompanied by reduced fuel economy.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4651.125.001 |
| Type | Inductive Proximity Sensor (2-wire) |
| Operating Voltage | 10–30 VDC |
| Output Signal | Frequency / Pulse (Hall-effect equivalent) |
| Housing Material | Stainless Steel (AISI 303) with PBT plastic connector |
| Thread Size | M12 x 1.5 |
| Overall Length | 55 mm (including connector) |
| Weight | 0.045 kg (45 g) |
| OEM Reference | ZF 4651.125.001 (Genuine) |
| Sealing | IP67 rated (with O-RING seal) |
Compatibility
This inductive sensor is designed primarily for the ZF WG 100 series, including models such as WG100, WG120, and WG150. It is also compatible with select WG180 and WG200 variants that share the same sensor mounting boss and electrical interface. The sensor integrates with the HOUSING and HOUSING assemblies found in these transmissions. Always verify your transmission serial number and housing configuration before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101007 | TRANSMISSION HOUSING | Main structural casing for gear train and valve body |
| 4651301029 | HOUSING | Secondary housing for sensor mounting and oil routing |
| 0634303928 | O-RING | Seals sensor-to-housing interface against fluid ingress |
| 4651301024 | HOUSING | Alternate housing variant for WG100 series |
| 4651203002 | SCREEN SHEET | Filters debris from hydraulic oil flow |
| 4651303005 | SCREEN SHEET | Fine mesh screen for valve body protection |
| 0636101032 | CAP SCREW | Fastens housing components to transmission case |
| 0630361028 | SEALING CAP | Closes unused ports to prevent contamination |
| 4475280060 | SCREW PLUG | Threaded plug for pressure test points |
| 0634303312 | O-RING | Seals screw plug and cap screw interfaces |
