HomeBelts and Cooling > SensorsStandard Ignition TX51 Engine Coolant Temperature Sensor
Part #: TX51

Standard Ignition TX51 Engine Coolant Temperature Sensor

⚙️ 64 vehicles fit this part
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OE Direct Replacement — Bolt-on fit, no modifications needed
🚗Fitment: BMW, Audi, and Volkswagen, 318i, 318is, 318ti, 740iL, 740i, S6, 530i, 540i, S4, V8 Quattro, 750iL, 535i, Golf, Coupe Quattro, 90, 535is, Quantum, 4000 Quattro, Coupe, 4000, and 524td
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Reliable Engine Coolant Temperature Sensor for Audi, BMW, Volkswagen

The Standard Ignition TX51 Engine Coolant Temperature Sensor is designed to provide accurate temperature readings for your vehicle's engine management system. Compatible with select Audi, BMW, and Volkswagen models, this sensor ensures optimal engine performance and efficient cooling system operation.

  • Attachment Method: Bolt on for secure installation
  • Connector Gender: Female with one rectangular plug-in connector
  • Material: Durable brass construction for long-lasting use
  • Terminal Type: Two male blade terminals for reliable electrical connection
  • Compatible with multiple Audi, BMW, and Volkswagen models including 318i, 535i, 740iL, Golf, and S4

Technical Details and Compatibility

The TX51 sensor features a bolt-on attachment method, making it straightforward to install on compatible vehicles. Its female rectangular plug-in connector with a single connection point ensures a secure fit with the vehicle’s wiring harness. Constructed from brass, the sensor offers resistance to corrosion and heat, which is critical for accurate temperature measurement in the engine coolant system. The two male blade terminals provide a stable electrical interface, minimizing the risk of connection issues.

This sensor is compatible with a range of Audi models such as the 4000 and 4000 Quattro, BMW models including the 318i, 318is, 318ti, 524td, 530i, 535i, 535is, 540i, 740i, 740iL, and 750iL, as well as Volkswagen models like the Golf, Quantum, S4, S6, and V8 Quattro. The part number TX51 ensures you are selecting the correct sensor for these specific vehicles.

Common Applications and Problem Resolution

  • Helps regulate engine temperature by providing accurate coolant temperature data
  • Prevents engine overheating by enabling proper cooling fan operation
  • Supports efficient fuel injection timing and engine performance
  • Resolves issues related to erratic temperature gauge readings
  • Addresses engine warning light triggers caused by faulty temperature sensors

Installation Notes and Tips

When installing the Standard Ignition TX51 sensor, ensure the engine is cool to avoid burns or injury. Use the bolt-on attachment method to secure the sensor firmly in place. Verify the female rectangular plug-in connector aligns correctly with the vehicle’s wiring harness. Check that the two male blade terminals are clean and free of corrosion before connecting. After installation, clear any diagnostic trouble codes and monitor engine temperature readings to confirm proper sensor function.

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM specifications, ensuring reliable performance and durability. The TX51 Engine Coolant Temperature Sensor undergoes rigorous quality control testing to maintain consistent accuracy and longevity. This part is backed by Standard Ignition’s limited warranty, providing coverage against defects in material and workmanship under normal use.

BrandStandard Ignition
Part NumberTX51
Attachment MethodBolt On
Connector GenderFemale
Connector ShapeRectangular
Connector TypePlug In
MaterialBrass
Terminal GenderMale
Terminal TypeBlade

This part fits 64 vehicles. Search below:

YearMakeModelTransmissionLitersCylindersPositionNotes
1999BMW318iN/A2 Terminal Fitment
1999BMW318isN/A2 Terminal Fitment
1999BMW318tiN/A2 Terminal Fitment
1999BMW740iLN/AThreaded; 2 Term.
1998BMW740iN/A2 Terminal Fitment
1998BMW740iLN/AOn Thermostat Housing
1997AudiS6N/AWhite; 2 Pin
1997BMW740iN/A2 Terminal Fitment
1997BMW740iLN/AOn Thermostat Housing
1996AudiS6N/AWhite; 2 Pin
1996BMW740iLN/AOn Thermostat Housing
1995AudiS6N/AWhite; 2 Pin
1995BMW530iN/A
1995BMW540iN/A
1995BMW740iN/A2 Terminal Fitment
1995BMW740iLN/AOn Thermostat Housing
1994AudiS4N/A
1994AudiV8 QuattroN/A
1994BMW530iN/A
1994BMW540iN/A
1994BMW740iN/A2 Terminal Fitment
1994BMW740iLN/AOn Thermostat Housing
1994BMW750iLN/A2 Terminal Fitment
1993AudiS4N/A
1993AudiV8 QuattroN/A
1993BMW535iN/A
1993BMW740iN/A
1993BMW740iLN/AOn Thermostat Housing
1993BMW750iLN/A2 Terminal Fitment
1992AudiS4N/A
1992AudiV8 QuattroN/A
1992BMW535iN/A
1992BMW750iLN/A2 Terminal Fitment
1992VolkswagenGolf1.6LL4N/A
1991AudiCoupe QuattroN/A
1991AudiV8 QuattroN/A
1991BMW535iN/A
1991BMW750iLN/A2 Terminal Fitment
1991VolkswagenGolf1.6LL4N/A
1990AudiCoupe QuattroN/A
1990AudiV8 QuattroN/A
1990BMW535iN/A
1990BMW750iLN/A2 Terminal Fitment
1989BMW750iLN/A2 Terminal Fitment
1988Audi90Automatic2.3LL5N/A
1988BMW535iN/A
1988BMW535isN/ACenter Sensor; Located On Thermostat Housing
1988BMW750iLN/A2 Terminal Fitment
1988VolkswagenQuantumN/A
1987Audi4000 Quattro2.2LL5N/A
1987AudiCoupe2.2LL5N/A
1987VolkswagenQuantumN/A
1986Audi40002.2LL5N/A
1986Audi4000 Quattro2.2LL5N/A
1986AudiCoupeN/A
1986BMW524tdN/A
1986VolkswagenQuantumN/A
1985Audi40002.2LL5N/A
1985Audi4000 Quattro2.2LL5N/A
1985AudiCoupeN/A
1985BMW524tdN/A
1985VolkswagenQuantum2.2LL5N/A
1984Audi40002.2LL5N/A
1984Audi4000 Quattro2.2LL5N/A

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

0091073510280130037035919369M1204312621288158140-80215-50734158-073717-1208211-10352CTS01033644240214X-10455S1239471-25237393374021CT0030CTSA111TS10143TS5561WT3064WTC1608

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.