AutoCodes – Nissan – P0123 2002 Nissan Sentra

P0123 2002 Nissan Sentra Code - Throttle Position Sensor/Switch '1' Circuit High Input

Quick Answer

The Throttle Position Sensor (TPS) responds to the accelerator pedal movement. 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: P0123 2002 Nissan Sentra indicates Throttle Position Sensor/Switch '1' Circuit High Input.
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 5,501

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
Cost to Diagnose
FAQs
Comments
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Code P0123 2002 Nissan Sentra 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 P0123 2002 Nissan Sentra - Throttle Position Sensor/Switch '1' Circuit High Input - AutoCodes.com — P0123 2002 Nissan Sentra Code - Throttle Position Sensor/Switch '1' Circuit High Input

What does this mean?

What are the Possible Causes of the DTC P0123 2002 Nissan Sentra?

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

How to Fix the DTC P0123 2002 Nissan Sentra?

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 P0123 2002 Nissan Sentra 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 P0123 2002 Nissan Sentra Code

1. What does OBDII code P0123 mean on a 2002 Nissan Sentra?

Code P0123 indicates a high input in the throttle position sensor/switch '1' circuit in your vehicle.

2. What are the common symptoms of a P0123 code in a 2002 Nissan Sentra?

Common symptoms include issues with acceleration, reduced engine power, stalling, and possible difficulty shifting gears.

3. What are the possible causes of a P0123 code in a 2002 Nissan Sentra?

Potential causes include a faulty throttle position sensor, damaged wiring or connectors in the sensor circuit, or issues with the engine control module.

4. How can I diagnose a P0123 code in my 2002 Nissan Sentra?

Diagnostic steps may involve checking the throttle position sensor's voltage output, inspecting the sensor's wiring and connections, and using a scan tool to monitor sensor performance.

5. Can I still drive my 2002 Nissan Sentra with a P0123 code?

It is not recommended to drive your vehicle with a P0123 code as it can lead to further damage and safety hazards. It's best to address the issue promptly.

6. How can I repair a P0123 code in my 2002 Nissan Sentra?

Repair options may include replacing the throttle position sensor, repairing damaged wiring or connectors, or resetting the engine control module after fixing the issue.

7. Is it possible to reset a P0123 code in a 2002 Nissan Sentra without repairs?

While clearing the code temporarily may be possible, it is crucial to address the underlying issue causing the P0123 code to prevent further problems down the line.

8. How much does it typically cost to repair a P0123 code in a 2002 Nissan Sentra?

The cost of repairing a P0123 code can vary depending on the specific cause of the issue, parts needed, and labor costs. It's advisable to consult a professional for an accurate estimate.

9. Can a DIY enthusiast fix a P0123 code in a 2002 Nissan Sentra?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to address a P0123 code by following repair guides or tutorials. However, seeking professional help is recommended for complex issues.

10. How can I prevent a P0123 code from recurring in my 2002 Nissan Sentra?

To prevent the P0123 code from coming back, ensure regular maintenance of your vehicle, address any related issues promptly, and follow manufacturer-recommended service schedules.