Toyota Error Code P1725: How to Fix It

Medium 1-2 hours High Severity Verified June 2026
Error Code
P1725
Brand
Toyota
Product Type
automotive
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
1-2 hours
Toyota error code P1725 indicates a problem with the input turbine speed sensor circuit in your automatic transmission. This sensor monitors the rotation speed of the transmission's input shaft and sends this data to the ECU. When this circuit fails, you may experience transmission shifting problems, reduced fuel economy, or the transmission may enter limp mode.
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Tools You'll Need

How to Fix Error Code P1725

  1. Connect OBD2 Scanner and Verify Code

    Ensure the vehicle is parked on level ground with parking brake engaged before beginning diagnostics.
  2. Check Transmission Fluid Level and Condition

    Hot transmission fluid can cause severe burns. Allow the vehicle to cool for at least 30 minutes before checking fluid level.
  3. Locate the Input Speed Sensor

  4. Inspect Wiring Harness and Connector

    Disconnect the battery negative terminal before working on electrical connections to prevent short circuits.
  5. Test Sensor Resistance

  6. Remove and Inspect the Sensor

    Some transmission fluid may leak when removing the sensor. Have a drain pan ready and replace the O-ring seal during reinstallation.
  7. Replace the Input Speed Sensor

  8. Clear Codes and Test Drive

Parts You May Need

Input Turbine Speed Sensor
Check Price on Amazon
Transmission Fluid
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Electrical Contact Cleaner
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Input Turbine Speed Sensor
Check Price on Amazon
Transmission Fluid
Check Price on Amazon
Electrical Contact Cleaner
Check Price on Amazon
Input Turbine Speed Sensor
Check Price on Amazon
Transmission Fluid
Check Price on Amazon
Electrical Contact Cleaner
Check Price on Amazon
Input Turbine Speed Sensor
Check Price on Amazon
Transmission Fluid
Check Price on Amazon
Electrical Contact Cleaner
Check Price on Amazon
Input Turbine Speed Sensor
Check Price on Amazon
Transmission Fluid
Check Price on Amazon
Electrical Contact Cleaner
Check Price on Amazon
Input Turbine Speed Sensor
Check Price on Amazon
Transmission Fluid
Check Price on Amazon
Electrical Contact Cleaner
Check Price on Amazon
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When to Call a Professional

Contact a qualified transmission specialist if the sensor tests good but the code persists, if you find metal debris on the sensor tip indicating internal transmission damage, or if the transmission exhibits severe shifting problems or slipping. Internal transmission problems require specialized tools and expertise to diagnose and repair properly.

Frequently Asked Questions

Can I drive with Toyota error code P1725?
You should avoid driving with P1725 as it can cause the transmission to shift improperly or enter limp mode. Continued driving may lead to more severe and expensive transmission damage.
How much does it cost to fix P1725 on a Toyota?
If the issue is just a faulty sensor, expect to pay $150-300 for parts and labor. However, if internal transmission damage is present, repairs can cost $2000-4000 or more depending on the extent of damage.
What causes Toyota P1725 error code?
P1725 is typically caused by a faulty input turbine speed sensor, damaged wiring, corroded connections, low transmission fluid, or internal transmission problems affecting the sensor's ability to read input shaft speed accurately.
Will P1725 cause my Toyota to fail emissions testing?
Yes, P1725 will likely cause your Toyota to fail emissions testing since it's a powertrain-related code that affects the vehicle's monitoring systems. The code must be cleared and the issue resolved before passing inspection.
How do I reset Toyota error code P1725?
Use an OBD2 scanner to clear the code, but simply clearing it won't fix the underlying problem. The code will return if the input speed sensor circuit issue isn't properly diagnosed and repaired.