Standard Ignition TX51 Engine Coolant Temperature Sensor

Engine Coolant Temperature Sensor for BMW and Audi

Standard Ignition TX51 is an engine coolant temperature sensor built with a brass body, a bolt-on attachment method, and a rectangular plug-in connector. It uses a female connector with two male blade terminals for direct replacement service on supported BMW, Audi, and Volkswagen applications.

Key Features

• Engine coolant temperature sensor for cooling system signal input
• Brass sensor body for durable coolant-side construction
• Bolt-on attachment method for secure mounting
• Rectangular, plug-in connector with female housing
• 2-terminal blade design for the listed applications
• Standard Ignition TX51 replacement part number

Detailed Description

Standard Ignition TX51 is an engine coolant temperature sensor used to report coolant temperature to the vehicle control system. Accurate temperature input is important for fuel delivery, idle quality, and cooling fan strategy. This TX51 sensor is listed for a wide range of BMW, Audi, and Volkswagen models, including 1999 BMW 318i, 1999 BMW 318is, 1999 BMW 318ti, 1997-1998 BMW 740i, 1993-1998 BMW 740iL, 1995-1997 Audi S6, and 1992-1994 Audi S4. It also cross-references Bosch 0280130037 for the same application.

Compatible vehicle coverage also includes 1994-1995 BMW 530i, 1994-1995 BMW 540i, 1990-1994 Audi V8 Quattro, 1988-1994 BMW 750iL, 1990-1993 BMW 535i, 1991-1992 Volkswagen Golf, 1985-1988 Volkswagen Quantum, and additional listed Audi and BMW applications. Standard Ignition TX51 is a direct-fit service part for vehicles that use the specified 2-terminal coolant temperature sensor configuration.

What It Helps Address

• Incorrect coolant temperature signal to the engine control system
• Hard starting or rough idle related to temperature input errors
• Cooling fan operation concerns tied to sensor feedback
• Fuel mixture issues caused by inaccurate coolant temperature data
• Check engine light conditions related to coolant temperature sensor faults

Installation Notes

• Verify connector style, terminal count, and mounting style before installation.
• Confirm the vehicle uses the listed 2-terminal fitment and threaded or thermostat-housing location noted in the fitment data.
• Inspect the connector and wiring for corrosion or damage before replacing the sensor.
• Use the vehicle service information for the correct torque and sealing procedure.

Quality Assurance

Standard Ignition TX51 is built to match the listed OE-style application requirements for the supported BMW, Audi, and Volkswagen fitments. Confirm part number TX51 against the original sensor and connector configuration before installation.