AutoCodes – Nissan – P0121 Nissan

P0121 Nissan Code - Throttle Position Sensor Circuit Range/Performance Problem

Quick Answer

Electric Throttle Control Actuator consists of throttle control motor, throttle position sensor, etc. Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor circuit poor electrical connection. 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 Nissan indicates Throttle Position Sensor Circuit Range/Performance Problem.
Common causes: Common causes include Faulty throttle position sensor, Throttle position sensor harness is open or shorted, Throttle position sensor circuit poor electrical connection.
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 46,830

How popular is this code, among other codes? Medium

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
Cost to Diagnose
FAQs
Comments
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Code P0121 Nissan Description

Electric Throttle Control Actuator consists of throttle control motor, throttle position sensor, etc. The throttle position sensor responds to the throttle valve movement. The throttle position sensor has the two sensors. These sensors are a kind of potentiometers which transform the throttle valve position into output voltage, and emit the voltage signal to the ECM. In addition, these sensors detect the opening and closing speed of the throttle valve and feed the voltage signals to the ECM. The ECM
judges the current opening angle of the throttle valve from these signals and the ECM controls the throttle control motor to make the throttle valve opening angle properly in response to driving condition.

OBDII Code P0121 Nissan - Throttle Position Sensor Circuit Range/Performance Problem - AutoCodes.com — P0121 Nissan Code - Throttle Position Sensor Circuit Range/Performance Problem

What does this mean?

What are the Possible Causes of the DTC P0121 Nissan?

Faulty throttle position sensor.
Throttle position sensor harness is open or shorted
Throttle position sensor circuit poor electrical connection
Faulty accelerator pedal position sensor

How to Fix the DTC P0121 Nissan?

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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0121 Nissan 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.

Need more information about the P0121 Nissan code?

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

Need Help with the Code?

Get the P0121 Nissan code diagnosed by a professional: Find a repair shop in your area

Information for Specific Nissan Models

P0121 2004 Nissan Maxima — Throttle Position Sensor Circuit Range/Performance Problem

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 Nissan Code

1. What are common symptoms of the P0121 OBDII code in a Nissan?

- Common symptoms include poor acceleration, stalling, rough idling, and unresponsive throttle.

2. What causes the P0121 OBDII code to appear in a Nissan?

- The P0121 code is typically triggered by a faulty throttle position sensor, wiring issues, or a damaged connector.

3. How can I diagnose the P0121 code in my Nissan?

- To diagnose the P0121 code, you can use a scan tool to check for the code, inspect the throttle position sensor and its wiring for any visible damage, and perform voltage tests.

4. Can I still drive my Nissan with the P0121 code present?

- It is not recommended to drive your Nissan with the P0121 code present, as it can lead to poor vehicle performance and potentially unsafe driving conditions.

5. What are some repair tips for fixing the P0121 code in a Nissan?

- Repair tips include replacing the throttle position sensor, repairing any damaged wiring or connectors, and clearing the code with a scan tool after completing the repairs.

6. How much does it typically cost to repair the P0121 code in a Nissan?

- The cost of repairing the P0121 code can vary depending on the extent of the damage and the specific parts that need to be replaced, but it can range from $100 to $300 on average.

7. Are there any DIY solutions for the P0121 code in a Nissan?

- While some basic troubleshooting and inspections can be done by DIY enthusiasts, it is recommended to consult a professional mechanic for proper diagnosis and repairs to ensure the issue is fully resolved.

8. Will the P0121 code reset on its own in a Nissan?

- The P0121 code may reset on its own if the underlying issue is intermittent, but it is best to address the problem promptly to avoid potential damage to the vehicle's engine or drivetrain.

9. Can a dirty throttle body cause the P0121 code in a Nissan?

- A dirty throttle body can contribute to throttle position sensor issues, which may trigger the P0121 code. Regular maintenance, such as cleaning the throttle body, can help prevent related problems.

10. Is the P0121 code specific to Nissan vehicles?

- No, the P0121 OBDII code is a generic code related to throttle position sensor circuit range/performance problems and can appear in various vehicle makes and models, not just Nissan.