HomeTransmission > SensorsStandard Ignition TS-421 Automatic Transmission Fluid Temperature Sensor
Part #: TS-421

Standard Ignition TS-421 Automatic Transmission Fluid Temperature Sensor

5 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$96.06Free Shipping
Free ShippingNo Cost to Continental U.S.
Free Returns*Wrong fit? No cost
60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Toyota, RAV4
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST

Reliable Automatic Transmission Fluid Temperature Sensor for Toyota RAV4

The Standard Ignition TS-421 Automatic Transmission Fluid Temperature Sensor is designed specifically for Toyota RAV4 models. This sensor provides accurate temperature readings essential for optimal transmission performance and longevity.

  • Attachment Method: Screw on for secure installation
  • Straight bend angle for easy fitment
  • Durable brass finish with gold and black color accents
  • Female square plug-in connector with one terminal
  • Brass blade terminal for reliable electrical contact
  • Includes one o-ring for proper sealing
  • Constructed from plastic and brass materials
  • Length of 1.48 inches for precise fit
  • Operates at 12 volts

Detailed Product Description

The Standard Ignition TS-421 sensor is engineered to monitor the temperature of the automatic transmission fluid in Toyota RAV4 vehicles. Featuring a screw-on attachment method and a straight bend angle, this sensor ensures straightforward installation and compatibility. The sensor’s connector is a female, square-shaped plug-in type with a single brass blade terminal, providing a secure and stable electrical connection. Its brass finish and plastic body offer durability and resistance to typical engine bay conditions, while the included o-ring helps maintain a proper seal to prevent leaks. Measuring 1.48 inches in length, this sensor fits precisely in the designated transmission port.

Common Applications and Issues Addressed

  • Helps prevent transmission overheating by providing accurate fluid temperature data
  • Supports proper transmission shifting by enabling temperature-based adjustments
  • Reduces risk of transmission damage due to incorrect fluid temperature readings
  • Resolves transmission warning light triggers related to temperature sensor faults
  • Improves overall transmission system reliability in Toyota RAV4 models

Installation Notes and Tips

When installing the Standard Ignition TS-421 sensor, ensure the transmission is cool to avoid burns. Use the screw-on method to secure the sensor firmly in place. Replace the included o-ring to maintain a proper seal and prevent fluid leaks. Verify the connector is fully engaged and the blade terminal is clean for optimal electrical contact. No wiring harness is included, so use the existing vehicle harness for connection.

Quality Assurance and Warranty

Standard Ignition parts are manufactured to meet or exceed OEM specifications for fit, form, and function. The TS-421 sensor undergoes rigorous quality control to ensure reliable performance in Toyota RAV4 vehicles. While specific warranty details are not provided here, Standard Ignition typically offers limited warranties covering defects in materials and workmanship.

BrandStandard Ignition
Part NumberTS-421
ColorBlack
Connector GenderFemale
Connector ShapeOval
Connector TypePlug In
Contents1 O-ring
FinishBrass
Terminal GenderMale
Terminal TypeBlade
Voltage12

This part fits 5 vehicles. Search below:

YearMakeModelPositionNotes
2000ToyotaRAV4N/A
1999ToyotaRAV4N/A
1998ToyotaRAV4N/A
1997ToyotaRAV4N/A
1996ToyotaRAV4N/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:

15-50395158-143517-14741S750353-579028942812140SW5051TS6166TW310WT766

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