Standard Ignition TX221 Engine Oil Temperature Sensor

Engine Oil Temperature Sensor for Toyota and Mazda Applications

Standard Ignition TX221 is an engine oil temperature sensor built for direct replacement in select Toyota, Scion, and Mazda applications. It uses a bolt-on attachment method with a square, plug-in female connector and male blade terminals for a straightforward OE-style connection.

Key Features

• Engine oil temperature sensor for engine management and temperature monitoring
• Bolt-on mounting for secure installation
• Square female connector with plug-in design
• 2 male blade terminals for the vehicle harness connection
• Fits radiator-mounted and coolant crossover tube applications, depending on vehicle
• Standard Ignition TX221 replacement part number for service matching

Detailed Description

Standard Ignition TX221 is a replacement engine oil temperature sensor used in select Toyota Prius, Prius C, Prius V, Prius Plug-In, Yaris, Yaris iA, Scion iA, and Mazda 2 applications. This sensor is specified for multiple mounting locations, including radiator and coolant crossover tube positions, and is listed with application notes such as white connector usage on certain Prius models. For buyers searching for a Toyota Prius oil temperature sensor, Prius coolant crossover tube sensor, or Mazda 2 radiator sensor, TX221 provides a direct-fit service part reference.

This part cross-references Beck/Arnley 158-1585 and Walker Products 211-1060 for the same application. Standard Ignition TX221 is also a useful reference when matching OE-style service parts for Toyota Prius and related hybrid cooling system temperature sensing needs.

What It Is Used For

• Replacing a failed engine oil temperature sensor
• Restoring accurate temperature signal input to the engine control system
• Addressing temperature-related warning lights or diagnostic trouble codes
• Correcting intermittent sensor readings caused by connector or terminal wear
• Servicing radiator-mounted or coolant crossover tube sensor locations

Installation Notes and Tips

Verify connector shape, terminal style, and mounting location before installation. TX221 uses a female square connector with two male blade terminals and a bolt-on attachment method, so the harness and sensor interface should be matched to the original part. Confirm whether the vehicle uses the radiator position or the coolant crossover tube location, especially on 2004-2017 Toyota Prius applications.

• Fits 2019-2020 Toyota Yaris, Radiator
• Fits 2017-2018 Toyota Yaris iA, Radiator
• Fits 2016-2017 Toyota Prius, N/A, w/ White Connector; Located On Coolant Crossover Tube
• Fits 2012-2017 Toyota Prius C, N/A
• Fits 2012-2017 Toyota Prius V, N/A
• Fits 2016 Scion iA, Radiator
• Fits 2011-2015 Mazda 2, Radiator
• Fits 2004-2015 Toyota Prius, N/A, Located On Coolant Crossover Tube
• Fits 2012-2015 Toyota Prius Plug-In, N/A
• Fits 2004-2009 Toyota Prius, N/A

Quality Assurance

Standard Ignition is a recognized aftermarket brand for engine management and sensor replacement parts. TX221 is built to match the listed connector, terminal, and mounting specifications for the covered Toyota Prius, Yaris, Scion iA, and Mazda 2 applications.