Bosch 0986280402 Rot.-Speed Sensor

Bosch 0986280402 Rot.-Speed Sensor

The Bosch 0986280402 Rot.-Speed Sensor is a high‑performance crankshaft pulse generator designed for modern internal combustion engines. It delivers precise engine speed data to the Engine Control Unit (ECU), enabling optimal fuel injection, ignition timing, and overall engine management.

Key Functionalities

• Crankshaft Pulse Generation: Converts mechanical rotation of the crankshaft into a series of electrical pulses. These pulses are used by the ECU to calculate RPM and determine ignition timing.
• High Accuracy: Provides accurate speed measurement across a wide range of engine speeds, ensuring reliable operation under both idle and high‑load conditions.
• Robust Construction: Built with durable materials that withstand extreme temperatures, vibration, and corrosive engine environments.
• Compact Design: Small footprint allows easy integration into existing engine bays without requiring significant modifications.

Technical Specifications

Compatibility and Applications

The sensor is engineered to fit a wide range of vehicles, particularly those from the European market. It is commonly used in:

• CITROËN models such as Berlingo, Xantia, Xsara, and XM.
• PEUGEOT vehicles including 206, 306, 406, 605, and Partner.
• FIAT engines found in Ducato, Ulysse, Scudo, and Boxer series.
• LANCIA Zeta and other Lancia models.
• RENAULT vehicles like the Espace III and Laguna I.

Because of its standardized mounting flange and signal interface, the sensor can be swapped into many engines with minimal re‑engineering. It is also compatible with aftermarket ECU systems that require a reliable crankshaft speed input.

Installation Overview

1. Remove Old Sensor: Disconnect the wiring harness, unscrew the mounting bolts, and carefully detach the sensor from the crankshaft pulley or gear.
2. Prepare New Sensor: Verify that the new Bosch 0986280402 is free of dust and debris. Align the sensor’s magnetic pole with the crankshaft tooth or gear slot.
3. Mounting: Secure the sensor using the supplied bolts, ensuring a tight fit to prevent vibration‑induced signal loss.
4. Reconnect Wiring: Attach the harness connector, double‑check polarity and continuity, then route the cable away from hot components.
5. Testing: Start the engine and verify that the ECU registers a stable RPM reading. Use diagnostic software to confirm pulse frequency matches expected values.

Performance Benefits

• Improved Fuel Efficiency: Accurate speed data allows the ECU to optimize fuel injection timing, reducing consumption and emissions.
• Enhanced Engine Response: Precise RPM measurement leads to smoother throttle response and better acceleration characteristics.
• Reliability Under Stress: The sensor’s robust construction ensures consistent operation even in high‑temperature or high‑vibration environments.
• Long Service Life: Designed for extended durability, the sensor typically outlasts many aftermarket alternatives.

Maintenance Tips

While the Bosch 0986280402 is engineered for longevity, routine checks can preempt potential issues:

• Inspect wiring harnesses for fraying or corrosion during regular maintenance intervals.
• Verify that the sensor’s mounting surface remains clean and free of oil or coolant residues.
• Use diagnostic tools to monitor pulse frequency drift, which may indicate wear or misalignment.

Conclusion

The Bosch 0986280402 Rot.-Speed Sensor is a cornerstone component for modern engine management systems. Its precise crankshaft speed measurement capability, combined with durable construction and broad vehicle compatibility, makes it an essential choice for both OEM installations and high‑performance aftermarket applications.