AutoCodes – Ford – P0121 1997 Ford F150

P0121 1997 Ford F150 Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance

Quick Answer

The throttle position sensor (TPS) responds to the accelerator pedal movement. Common causes include Binding throttle linkage, Faulty throttle position sensor, Throttle position sensor harness is open or shorted. 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: P0121 1997 Ford F150 indicates Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance.
Common causes: Common causes include Binding throttle linkage, Faulty throttle position sensor, Throttle position sensor harness is open or shorted.
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.

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Code Popularity 4,057

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0121 1997 Ford F150 Description

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.

OBDII Code P0121 1997 Ford F150 - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance - AutoCodes.com — P0121 1997 Ford F150 Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0121 1997 Ford F150?

Binding throttle linkage
Faulty throttle position sensor
Throttle position sensor harness is open or shorted
Throttle position sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0121 1997 Ford F150?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

The TP sensor circuit is monitored by the PCM for a non closed throttle position at idle. If key ON engine running self-test terminates upon placing the transmission range selector in gear (DRIVE or REVERSE) or when closing the throttle (idle) after opening it (in PARK or NEUTRAL) the TP closed throttle position is not attained, the test fails.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0121 1997 Ford F150 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 P0121 1997 Ford F150 Code

1. What are common symptoms of OBDII code P0121 in a 1997 Ford F150?

- Common symptoms include poor acceleration, reduced engine power, stalling, and illuminated Check Engine Light.

2. What causes the Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance issue in a 1997 Ford F150?

- The P0121 code is often triggered by a faulty throttle position sensor, wiring issues, or a problem with the throttle body.

3. How can I diagnose the P0121 code in my 1997 Ford F150?

- Diagnosing the P0121 code involves using a scan tool to read the code, checking the throttle position sensor's voltage, and inspecting the wiring for any damage.

4. Can I drive my 1997 Ford F150 with the P0121 code present?

- It is not recommended to drive with the P0121 code active, as it can lead to decreased performance and potential safety issues.

5. How do I repair the Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance problem in my 1997 Ford F150?

- Repairing the P0121 code typically involves replacing the throttle position sensor, repairing any damaged wiring, or cleaning the throttle body.

6. Will resetting the Check Engine Light make the P0121 code go away in my 1997 Ford F150?

- Resetting the Check Engine Light may temporarily turn it off, but the underlying issue causing the P0121 code will likely persist until properly diagnosed and repaired.

7. Are there any DIY tips for fixing the OBDII code P0121 in a 1997 Ford F150?

- DIY tips include checking the throttle position sensor's wiring for damage, cleaning the throttle body, and ensuring proper connections.

8. How much does it cost to repair the Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance issue in a 1997 Ford F150?

- The cost of repairing the P0121 code can vary depending on the exact cause, but it may range from $100 to $300 for parts and labor.

9. Can a bad throttle position sensor cause other issues in a 1997 Ford F150 besides triggering the P0121 code?

- Yes, a faulty throttle position sensor can cause issues like poor fuel economy, rough idling, and difficulty shifting gears.

10. Is it safe to continue driving my 1997 Ford F150 if the throttle position sensor is malfunctioning?

- It is not recommended to drive with a malfunctioning throttle position sensor, as it can lead to unsafe driving conditions and potential damage to the vehicle.