Hitachi GLP2037 Diesel Preglow Time Relay Temperature Sensor

Hitachi Diesel Preglow Time Relay Temperature Sensor

The Hitachi GLP2037 is a diesel preglow time relay temperature sensor built to meet OE specifications for the exact vehicle application. It is a direct-fit emission control sensor for Mercedes-Benz diesel models that rely on accurate temperature input for preglow timing.

• OE-specification replacement for diesel preglow timing control
• Built for precise temperature sensing in the preglow relay circuit
• Designed for Mercedes-Benz diesel applications
• Part number: GLP2037
• Cross-reference: Bosch 132037

Application Details

Compatible With 1995-1997 Mercedes-Benz E300, N/A, and 1995 Mercedes-Benz S350, N/A. This Hitachi GLP2037 sensor supports diesel starting performance by providing the temperature signal used by the preglow time relay. It is a practical replacement for Mercedes-Benz E300 and Mercedes-Benz S350 diesel applications where accurate relay timing is required.

What It Helps Address

• Hard starting during cold diesel engine operation
• Incorrect preglow relay timing caused by a failed temperature sensor
• Extended glow plug activation or shortened preglow duration
• Temperature signal faults in the diesel starting system
• Driveability issues related to inconsistent cold-start behavior

Installation Notes and Tips

Verify the original connector style, sensor location, and OE part number before installation. Compare the existing unit against the vehicle service information for the Mercedes-Benz E300 or S350 to confirm the correct application. After installation, clear any stored fault codes and confirm proper preglow operation during a cold start.

Quality Assurance

Hitachi states that this sensor meets or exceeds OE specifications and is engineered for the specific vehicle application. The GLP2037 is positioned as a premium OE-style replacement for diesel preglow temperature sensing.