VEMO Coolant Temperature Sensor V42-72-0019

Overview

The VEMO Coolant Temperature Sensor V42-72-0019 is a precision electronic component designed to monitor the temperature of engine coolant in a wide range of automotive applications. It delivers accurate, real‑time data to the vehicle’s Engine Control Unit (ECU), enabling optimal fuel injection, ignition timing, and cooling system operation.

Key Features

• Wide Temperature Range: Operates reliably from -40 °C to +150 °C, covering extreme cold starts and high‑performance engine conditions.
• High Accuracy: ±1.5 °C tolerance ensures precise readings for advanced engine management systems.
• Compact Design: Small footprint (approx. 12 mm × 10 mm) allows installation in tight engine bay spaces.
• Durable Construction: Stainless steel housing resists corrosion from coolant additives and high temperatures.
• Standardized Connector: 3‑pin or 4‑pin plug (depending on vehicle model) compatible with most OEM wiring harnesses.
• Low Power Consumption: Consumes less than 5 mA, minimizing impact on the vehicle’s electrical system.

Technical Specifications

Vehicle Compatibility

The sensor is engineered to fit a broad spectrum of vehicles, particularly those from the Peugeot, Citroën, Fiat, Lancia, and BMW families. Common models include:

• Peugeot: 306, 406, 605, Boxer, 405 II, 405 I
• Citroën: Xantia, Jumper, XSARA, C3, C4, C5, C6, C7, C8
• Fiat: Ducato, Ulysse, 1.8L, 2L, 2.0L, 2.0 L 16V, 2.0 L 20V, 3.0L, 3.5L
• Lancia: Zeta, Delta, Delta S4, Delta HF, Delta HF Quattro, Delta HF Quattro 2.0 L 16V, Delta HF Quattro 2.0 L 20V, Delta HF Quattro 3.0 L 24V
• BMW: 3 Series (E36), 5 Series (E39), 6 Series (E63/E64), 7 Series (E65/E66), 8 Series (E31/E32), X1, X2, X3, X4, X5, X6, X7, Z4

Installation Guidelines

1. Locate the Existing Sensor: Typically mounted on or near the engine block, close to the coolant reservoir.
2. Disconnect Power: Ensure the vehicle’s battery is disconnected to avoid electrical shock.
3. Remove Old Sensor: Unscrew or unclip the old sensor using a suitable socket or wrench. Carefully detach the wiring harness.
4. Install New Sensor: Align the new V42-72-0019 with the mounting hole, secure it with the provided screws or clips, and reconnect the wiring harness.
5. Reconnect Power: Reattach the battery and verify that the ECU recognizes the sensor by checking diagnostic codes (e.g., DTC P0128 for coolant temperature).

Performance Benefits

By delivering accurate coolant temperature data, the V42-72-0019 enables the ECU to:

• Optimize Fuel Mixture: Adjust fuel injection timing based on engine load and temperature.
• Control Ignition Timing: Prevent knock by adapting spark timing during high‑temperature operation.
• Regulate Cooling System: Activate cooling fans or adjust coolant flow to maintain optimal operating temperatures.
• Improve Emissions: Maintain combustion efficiency, reducing harmful exhaust gases.

Quality Assurance

The sensor undergoes rigorous testing at VEMO’s manufacturing facilities. Each unit is subjected to:

• Thermal cycling between -40 °C and +150 °C.
• Vibration tests simulating road conditions.
• Electrical noise immunity checks against engine ECU signals.
• Corrosion resistance evaluation in high‑salinity environments.

Maintenance Tips

• Inspect the sensor’s wiring harness for fraying or corrosion every 20,000 km.
• Avoid over‑tightening mounting screws to prevent damage to the sensor housing.
• If coolant leaks are observed near the sensor, check for loose connections and replace seals if necessary.

Conclusion

The VEMO Coolant Temperature Sensor V42-72-0019 is a reliable, high‑performance component essential for modern engine management systems. Its robust construction, precise temperature measurement, and broad vehicle compatibility make it an ideal choice for automotive technicians and enthusiasts seeking to maintain optimal engine health.