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Engine-Codes – Toyota – P0122 2004 Toyota Highlander

P0122 2004 Toyota Highlander Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Quick Answer

The P0122 code for a 2004 Toyota Highlander indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. Common causes include Faulty Throttle Position Sensor, Damaged wiring or connectors in the TPS circuit, Dirty throttle body affecting sensor readings. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0122 2004 Toyota Highlander indicates Throttle Position Sensor/Switch 'A' Circuit Low Input.
Common causes
Common causes include Faulty Throttle Position Sensor, Damaged wiring or connectors in the TPS circuit, Dirty throttle body affecting sensor readings.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0122 2004 Toyota Highlander Description

The P0122 code for a 2004 Toyota Highlander indicates a problem with the Throttle Position Sensor/Switch 'A' Circuit, specifically a low input signal. The throttle position sensor (TPS) is a crucial component of the vehicle's electronic fuel injection system, as it monitors the position of the throttle valve and sends this information to the engine control module (ECM). The ECM uses this data to determine the appropriate air-fuel mixture for combustion.

OBDII Code P0122 2004 Toyota Highlander - Throttle Position Sensor/Switch 'A' Circuit Low Input
P0122 2004 Toyota Highlander Code - Throttle Position Sensor/Switch 'A' Circuit Low Input

Common Causes of P0122 2004 Toyota Highlander

  1. Faulty Throttle Position Sensor.
  2. Damaged wiring or connectors in the TPS circuit.
  3. Dirty throttle body affecting sensor readings.
  4. Issues with the Engine Control Module.
  5. Corrosion or moisture in the sensor connections.

Symptoms of P0122 2004 Toyota Highlander

  1. Poor acceleration and throttle response.
  2. Engine stalling or hesitation during acceleration.
  3. Rough idling or surging while driving.
  4. Decreased fuel efficiency.
  5. Check Engine Light illuminated on the dashboard.

How to Fix P0122 2004 Toyota Highlander

  1. Begin by diagnosing the issue using a scan tool to confirm the P0122 code and check for any other related codes.
  2. Inspect the throttle position sensor and its wiring for any visible damage or corrosion. Replace the sensor if necessary.
  3. Clean the throttle body to ensure accurate throttle position readings.
  4. Reset the ECM and clear the trouble codes from the system.
  5. Test drive the vehicle to ensure the issue has been resolved and the code does not reappear.

Cost to Fix P0122 2004 Toyota Highlander

The typical repair costs for addressing a P0122 code in a 2004 Toyota Highlander can range from $100 to $300, depending on the specific cause of the issue and the cost of replacement parts. This estimate includes the cost of a new throttle position sensor, labor for diagnosis and repair, and any additional materials needed for the job. Keep in mind that labor rates can vary significantly based on location, so it's advisable to check with local auto repair shops for an accurate estimate.

When is the Code Detected?

An excessively low voltage from the Throttle Position Sensor (TPS) is sent to Engine Control Module (ECM).

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0122 2004 Toyota Highlander Code

1. What are the common symptoms of OBDII code P0122 in a 2004 Toyota Highlander?

The common symptoms of OBDII code P0122 in a 2004 Toyota Highlander include poor acceleration, rough idling, stalling, and possible difficulty shifting gears.

2. What does the OBDII code P0122 for a 2004 Toyota Highlander indicate?

The OBDII code P0122 for a 2004 Toyota Highlander indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit Low Input.

3. What are the possible causes of OBDII code P0122 in a 2004 Toyota Highlander?

Possible causes of OBDII code P0122 in a 2004 Toyota Highlander include a faulty throttle position sensor, damaged wiring or connectors, or issues with the throttle body itself.

4. How can I diagnose the Throttle Position Sensor/Switch 'A' Circuit Low Input issue in my 2004 Toyota Highlander?

To diagnose the Throttle Position Sensor/Switch 'A' Circuit Low Input issue in a 2004 Toyota Highlander, you can use an OBDII scanner to read the trouble code, visually inspect the throttle position sensor and its wiring, and perform a voltage test on the sensor.

5. Can I still drive my 2004 Toyota Highlander with OBDII code P0122?

It is not recommended to drive your 2004 Toyota Highlander with OBDII code P0122, as it can lead to further damage to the engine and other components. It's best to address the issue promptly.

6. How can I repair OBDII code P0122 in my 2004 Toyota Highlander?

To repair OBDII code P0122 in a 2004 Toyota Highlander, you may need to replace the throttle position sensor, repair any damaged wiring or connectors, or clean the throttle body as needed.

7. Will resetting the OBDII code P0122 in my 2004 Toyota Highlander make it go away permanently?

Resetting the OBDII code P0122 in a 2004 Toyota Highlander may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and repair the root cause of the problem.

8. How much does it typically cost to fix OBDII code P0122 in a 2004 Toyota Highlander?

The cost to fix OBDII code P0122 in a 2004 Toyota Highlander can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a DIY enthusiast repair OBDII code P0122 in a 2004 Toyota Highlander?

A DIY enthusiast with the right tools and knowledge may be able to repair OBDII code P0122 in a 2004 Toyota Highlander by replacing the throttle position sensor or repairing wiring issues. However, if unsure, it's best to seek professional help.

10. How often does OBDII code P0122 occur in a 2004 Toyota Highlander?

OBDII code P0122, indicating an issue with the Throttle Position Sensor/Switch 'A' Circuit Low Input, can occur occasionally in a 2004 Toyota Highlander due to sensor wear, wiring issues, or other factors affecting the throttle system.

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