Engine-Codes - Toyota - P0121 2001 Toyota Corolla

P0121 2001 Toyota Corolla Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance 3ZZ-FE Engine

- Code Popularity: 3,872 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents
ChatAC AutoCodes.com AI Chat

What are the Possible Causes of the DTC P0121 2001 Toyota Corolla?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Faulty throttle position sensor
  • Throttle position sensor harness is open or shorted
  • Throttle position sensor circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
⚠ Does your Toyota have Safety Recalls? → Check here

How to Fix the DTC P0121 2001 Toyota Corolla?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

Search for P0121 2001 Toyota Corolla Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P0121 2001 Toyota Corolla code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

When is the Code Detected?

Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

What Does the P0121 2001 Toyota Corolla Code Mean?

The throttle position sensor (TPS) responds to the accelerator pedal movement. This sensor is a kind of potentiometer which transforms the throttle position into output voltage, and emits the voltage signal to the Engine Control Module (ECM). In addition, the sensor detects the opening and closing speed of the throttle valve and feeds the voltage signal to the ECM.
Idle position of the throttle valve is determined by the ECM receiving the signal from the throttle position sensor. This sensor controls engine operation such as fuel cut. On the other hand, the Wide open and closed throttle position switch, which is built into the throttle position sensor unit, is not used for engine control.

P0121 2001 Toyota Corolla Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance 3ZZ-FE Engine

Need more Information on the Code?

Need more information on how to fix the P0121 2001 Toyota Corolla code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0121 2001 Toyota Corolla code diagnosed by a professional: Find a repair shop in your area