Overview
The ZF 4646.125.010 INDUCTIVE SENSOR is a precision electronic component engineered specifically for the WG 250 series transmission. This OEM genuine part monitors rotational speed and position of internal shafts by generating a magnetic field that detects ferrous targets without physical contact. Mounted directly into the TRANSMISSION HOUSING, the sensor relays critical data to the transmission control unit, enabling precise shift timing and clutch modulation. The SKU 4646.125.010 ensures exact fitment and signal integrity, preventing false readings that can degrade driveline performance.
Symptoms of Failure
- Erratic gear engagement or delayed shifting: A failing sensor sends intermittent or no signal, causing the TCU to miscalculate shift points, often resulting in harsh or missed shifts during acceleration.
- Transmission enters limp mode with no speed reading: When the inductive sensor fails completely, the system loses output speed data, forcing the transmission into a protective safe mode with reduced power and fixed gear operation.
- Intermittent loss of torque converter lockup: A worn sensor may produce weak signals at low RPM, preventing the torque converter clutch from engaging, leading to increased fluid temperatures and reduced fuel economy.
- Check transmission warning light with diagnostic code P0722: This specific code indicates output speed sensor circuit malfunction, directly traceable to a degraded 4646.125.010 unit.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 4646.125.010 |
| Type | Inductive proximity sensor (2-wire) |
| Housing Material | Nickel-plated brass with PBT sensing face |
| Thread Size | M12 x 1.0 |
| Overall Length | 45 mm |
| Weight | 0.035 kg |
| Operating Voltage | 10–30 VDC |
| Output Type | NPN normally open (NO) |
| OEM Reference | ZF 4646.125.010 |
| Sealing | IP67 rated with O-ring |
Compatibility
This inductive sensor is a direct OE replacement for the ZF WG 250 series transmission. Based on its design and mounting interface, it also fits the WG 180, WG 200, and WG 210 models that share the same HOUSING architecture. The sensor interfaces with the COVER assembly and the CONNECTING PART that routes the wiring harness. Always verify the sensor bore depth in your specific housing variant before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4646101062 | TRANSMISSION HOUSING | Main structural casing that houses the sensor bore |
| 4646301104 | HOUSING | Secondary housing for valve body and sensor mount |
| 4646301300 | COVER | Protective cover over sensor wiring cavity |
| 4646323018 | CONNECTING PART | Harness connector bracket for sensor lead |
| 0636015304 | HEXAGON SCREW | Fastener for sensor mounting bracket |
| 0636101828 | CAP SCREW | Secures cover plate over sensor access |
| 4646301100 | COVER SHEET | Thin gasket between housing and cover |
| 4646301112 | COVER SHEET | Alternate gasket for different housing variant |
| 0730365067 | TYPE PLATE | Identification plate for transmission model |
| 0631311009 | GROOVED STUD | Alignment pin for sensor positioning |
