Overview
The ZF 4661.125.001 INDUCTIVE SENSOR is a critical electronic component engineered for the WG94 transmission series. This OEM genuine part monitors rotational speed and position of internal shafts by generating a magnetic field that detects ferrous targets without physical contact. Installed directly into the transmission housing, the sensor relays real-time data to the control unit, ensuring precise gear engagement and clutch modulation. The SKU 4661.125.001 is specifically calibrated for the WG94 platform, providing a direct replacement that restores factory-level signal accuracy. When paired with a robust 4661101013: TRANSMISSION HOUSING, this sensor maintains its alignment and sealing integrity under high-vibration conditions.
Symptoms of Failure
- Erratic gear shifting or delayed engagement — A failing inductive sensor sends intermittent or false speed signals, causing the transmission control module to miscalculate shift timing, often leading to harsh or missed shifts.
- Transmission entering limp mode — When the sensor completely fails, the system defaults to a protective limp-home mode, limiting speed and gear range to prevent internal damage.
- Inaccurate speedometer or tachometer readings — Since the sensor provides input for vehicle speed calculation, a worn unit can cause the gauge cluster to display erratic or zero readings.
- Unusual whining or grinding noises from the gearbox — A degraded sensor may allow slight misalignment of internal components, leading to abnormal contact between gears and bearings.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | 4661.125.001 |
| Type | Inductive Proximity Sensor (2-wire) |
| Operating Voltage | 10–30 V DC |
| Output Signal | Digital (Frequency) |
| Housing Material | Stainless Steel / Nickel-Plated Brass |
| Thread Size | M12 x 1.0 |
| Overall Length | 45 mm |
| Weight | 0.035 kg |
| OEM Reference | ZF 4661.125.001 |
| Protection Class | IP67 |
Compatibility
This inductive sensor is designed primarily for the ZF WG94 transmission series, which includes the WG94-1, WG94-2, and WG94-3 variants. It is also compatible with the broader WG family, including WG180, WG200, and WG240 models, where the sensor mounting boss and signal requirements match. For installations requiring a secure seal, ensure the 4661301022: HOUSING is free of debris and that the 0631306174: CYLINDRICAL PIN is properly aligned to prevent sensor damage during insertion. Always verify the 0769123894: TYPE PLATE on your transmission to confirm the exact series before ordering.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4661101013 | TRANSMISSION HOUSING | Main structural casing that encloses all gear train components |
| 4661301022 | HOUSING | Secondary housing for valve body and sensor mounting |
| 0631306174 | CYLINDRICAL PIN | Alignment dowel for precise sensor positioning |
| 0769123894 | TYPE PLATE | Identification tag with transmission model and serial number |
| 0750100022 | SCREW PLUG | Seals oil passages in the valve body |
| 4660201008 | SCREW PLUG | Closes sensor access port |
| 0636100117 | SCREW PLUG | Drain or fill plug for transmission fluid |
| 0501211384 | VALVE | Hydraulic control valve for clutch modulation |
| 0732042156 | COMPRESSION SPRING | Provides return force for valve spools |
| 0636100820 | SCREW PLUG | Seals pressure test points |
