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Engine-Codes – Ford – P0122 1998 Ford F150

P0122 1998 Ford F150 Code - Throttle Position Sensor Circuit Low Input

Quick Answer

The P0122 diagnostic trouble code indicates that there is a low input signal from the throttle position sensor (TPS). Common causes include Faulty throttle position sensor, Wiring issues or loose connections in the TPS circuit, Corrosion or dirt buildup affecting TPS signal. 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 1998 Ford F150 indicates Throttle Position Sensor Circuit Low Input .
Common causes
Common causes include Faulty throttle position sensor, Wiring issues or loose connections in the TPS circuit, Corrosion or dirt buildup affecting TPS signal.
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 Aug 18, 2024
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Code P0122 1998 Ford F150 Description

The P0122 diagnostic trouble code indicates that there is a low input signal from the throttle position sensor (TPS). The 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). A low input signal from the TPS can lead to issues with fuel delivery, ignition timing, and overall engine performance. If left unaddressed, this issue can result in poor fuel efficiency, rough idling, hesitation during acceleration, and even stalling.

OBDII Code P0122 1998 Ford F150 - Throttle Position Sensor Circuit Low Input
P0122 1998 Ford F150 Code - Throttle Position Sensor Circuit Low Input

Common Causes of P0122 1998 Ford F150

  1. Faulty throttle position sensor
  2. Wiring issues or loose connections in the TPS circuit
  3. Corrosion or dirt buildup affecting TPS signal
  4. ECM software or hardware issues
  5. Mechanical issues with the throttle body

Symptoms of P0122 1998 Ford F150

  1. Engine hesitation or lack of response when pressing the accelerator pedal
  2. Rough idling or unstable engine speed
  3. Reduced fuel efficiency
  4. Check Engine Light illuminated on the dashboard
  5. Engine stalling or difficulty starting

How to Fix P0122 1998 Ford F150

  1. Begin by diagnosing the issue using a scan tool to confirm the P0122 code and pinpoint the exact cause.
  2. Inspect the throttle position sensor and its wiring for any signs of damage, corrosion, or loose connections.
  3. Test the TPS using a multimeter to check for proper voltage and resistance values.
  4. Replace the throttle position sensor if it is found to be faulty, ensuring proper installation and calibration.
  5. Clear the diagnostic trouble codes from the ECM and test drive the vehicle to confirm that the issue has been resolved.

Cost to Fix P0122 1998 Ford F150

The cost of repairing a throttle position sensor circuit low input issue on a 1998 Ford F150 can vary depending on the specific cause of the problem and the labor rates in your area. On average, the replacement of a throttle position sensor can range from $50 to $200, with additional costs for diagnostic time and labor. Overall, you can expect to pay anywhere from $150 to $400 for parts and labor. It's recommended to consult with a trusted mechanic or repair shop for an accurate estimate based on your vehicle's needs.

What does this mean?

Tech Notes for P0122 1998 Ford F150

The TP sensor circuit is monitored by the PCM for a low TP rotation angle (or voltage) input through the comprehensive component monitor (CCM). If during key ON engine OFF or key ON engine running the TP rotation angle (or voltage) changes below a minimum calibrated limit, the test fails.

Fault exhibits a symptom of limited power. A TP PID (TP VPID) reading less than 3.42% (0.17 volt) in key ON engine OFF, continuous memory or key ON engine running indicates a hard fault.

When is the Code Detected?

The Throttle Position Sensor (TPS) signal 1 circuit has reported an open or low voltage

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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 1998 Ford F150 Code

1. What does the OBDII code P0122 on a 1998 Ford F150 mean?

The code P0122 indicates a Throttle Position Sensor Circuit Low Input error on a 1998 Ford F150.

2. What are the common symptoms of a Throttle Position Sensor Circuit Low Input issue?

Common symptoms include poor acceleration, rough idling, stalling, and difficulty shifting gears.

3. What are the possible causes of the P0122 code on a 1998 Ford F150?

Potential causes include a faulty throttle position sensor, damaged wiring or connectors, a dirty throttle body, or a malfunctioning PCM.

4. How can I diagnose a Throttle Position Sensor Circuit Low Input problem on my 1998 Ford F150?

You can use a multimeter to test the throttle position sensor's voltage output, check for damaged wiring, and inspect the throttle body for any obstructions.

5. Can I drive my 1998 Ford F150 with the P0122 code present?

It is not recommended to drive the vehicle with the P0122 code active, as it can lead to further damage and unsafe driving conditions.

6. How can I repair a Throttle Position Sensor Circuit Low Input issue on my 1998 Ford F150?

Repair options include replacing the throttle position sensor, repairing damaged wiring, cleaning the throttle body, or reprogramming the PCM.

7. Will resetting the OBDII code P0122 on my 1998 Ford F150 make it go away?

Resetting the code may temporarily clear the error, but if the underlying issue is not addressed, the code is likely to reappear.

8. How much does it typically cost to fix a P0122 error on a 1998 Ford F150?

The cost of repair can vary depending on the specific issue, but it may range from $100 to $300 for parts and labor.

9. Are there any preventative measures to avoid the P0122 code on a 1998 Ford F150?

Regular maintenance, such as cleaning the throttle body and inspecting the wiring harness, can help prevent Throttle Position Sensor Circuit Low Input issues.

10. Can a DIY enthusiast fix a P0122 error on a 1998 Ford F150?

Depending on the skill level and tools available, some DIY enthusiasts may be able to diagnose and repair a Throttle Position Sensor Circuit Low Input problem, but it is recommended to seek professional assistance for accurate diagnosis and repair.

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