Overview
The ZF 4657.125.009 INDUCTIVE SENSOR is a critical electronic component within the WG210 series transmission, responsible for monitoring rotational speed and position of the drivetrain. This OEM genuine part, identified by SKU 4657.125.009, mounts directly into the TRANSMISSION HOUSING and interfaces with the HOUS.FRONT SECT to provide real-time data to the transmission control unit. By detecting ferrous targets on rotating shafts, it ensures precise shift timing and clutch engagement. Without this sensor, the transmission cannot accurately determine output speed, leading to degraded performance.
Symptoms of Failure
- Erratic gear shifting or gear slipping — When the inductive sensor fails, the transmission control unit receives no or intermittent speed signals, causing harsh shifts or unexpected neutral conditions.
- Check transmission light with speed sensor error codes — A worn 4657.125.009 often triggers diagnostic trouble codes (DTCs) related to input/output speed sensor circuit faults, visible on the dashboard.
- Transmission stuck in limp mode or failsafe mode — Loss of signal forces the system to default to a single gear, limiting vehicle speed and drivability until the sensor is replaced.
- Intermittent loss of power or hesitation during acceleration — As the sensor degrades, it may produce erratic readings, causing the transmission to momentarily disengage power delivery.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 4657.125.009 |
| Type | Inductive Speed Sensor (2-wire) |
| Housing Material | Stainless Steel / Thermoplastic |
| Thread Size | M12 x 1.5 |
| Overall Length | 55 mm (approx.) |
| Hex Size | 19 mm |
| Weight | 0.04 kg (0.09 lbs) |
| OEM Reference | ZF 4657.125.009 |
| Output Signal | Variable reluctance (sinusoidal) |
| Operating Temperature | -40°C to +150°C |
Compatibility
This inductive sensor is engineered for the ZF WG210 series, but it also fits earlier WG180, WG200, and WG250 models that utilize the same sensor mounting boss. It is a direct replacement for units requiring a M12x1.5 threaded sensor. Always verify that your transmission uses the HOUSING REAR PART with a sensor port, and that the CYLINDRICAL PIN alignment is correct during installation. The sensor is not compatible with electronic shift modules that require Hall-effect sensors.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4657101040 | TRANSMISSION HOUSING | Main structural casing housing all internal components |
| 4657201028 | HOUS.FRONT SECT | Front section of the transmission housing |
| 4657201013 | HOUSING REAR PART | Rear section of the transmission housing |
| 0631306792 | CYLINDRICAL PIN | Alignment pin for housing assembly |
| 0636100801 | CAP SCREW | Fastener for securing housing sections |
| 4656301148 | FIXING PLATE | Retaining plate for sensor or harness |
| 4657301034 | SCREEN SHEET | Filter screen for oil flow |
| 4657301049 | SCREEN SHEET | Secondary filter screen for oil flow |
| 0636100803 | CAP SCREW | Additional fastener for housing assembly |
| 4681301040 | OIL FEED.HOUSG. | Oil feed housing for lubrication circuit |
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