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Engine-Codes – Nissan – P0122 2002 Nissan Sentra

P0122 2002 Nissan Sentra Code - Throttle Position Sensor/Switch '1' Circuit Low Input

Quick Answer

The P0122 code for a 2002 Nissan Sentra indicates a problem with the Throttle Position Sensor/Switch '1' Circuit, specifically a low input signal. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or poor connections in the TPS circuit. 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 2002 Nissan Sentra indicates Throttle Position Sensor/Switch '1' Circuit Low Input.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or poor connections in the TPS circuit.
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 14, 2024
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Code P0122 2002 Nissan Sentra Description

The P0122 code for a 2002 Nissan Sentra indicates a problem with the Throttle Position Sensor/Switch '1' Circuit, specifically a low input signal. The throttle position sensor (TPS) is a crucial component of the vehicle's 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. When the TPS reports a low input signal, it means that the voltage signal from the sensor is lower than the expected range, indicating a potential issue with the sensor or its circuit.

OBDII Code P0122 2002 Nissan Sentra - Throttle Position Sensor/Switch '1' Circuit Low Input
P0122 2002 Nissan Sentra Code - Throttle Position Sensor/Switch '1' Circuit Low Input

Common Causes of P0122 2002 Nissan Sentra

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Corrosion or poor connections in the TPS circuit
  4. Issues with the ECM
  5. Environmental factors such as moisture or debris affecting sensor operation

Symptoms of P0122 2002 Nissan Sentra

  1. Rough idling or stalling
  2. Hesitation or lack of response when accelerating
  3. Poor fuel efficiency
  4. Check Engine Light illuminated
  5. Reduced engine performance

How to Fix P0122 2002 Nissan Sentra

  1. Begin by diagnosing the issue using a diagnostic scanner to confirm the P0122 code and identify the specific cause.
  2. Inspect the throttle position sensor, wiring, and connectors for any visible damage or corrosion. Replace any damaged components.
  3. Test the TPS using a multimeter to ensure it is providing the correct voltage signal within the specified range.
  4. Clear the error code from the ECM using the diagnostic scanner and perform a test drive to verify that the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause, potentially involving more in-depth electrical testing or component replacement.

Cost to Fix P0122 2002 Nissan Sentra

The typical repair costs for addressing a P0122 code on a 2002 Nissan Sentra can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Factors such as location, vehicle make and model, and engine type can also influence the final repair costs. For a more accurate estimate, it's recommended to consult with local auto repair shops.

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 2002 Nissan Sentra Code

1. What are the common symptoms of OBDII code P0122 in a 2002 Nissan Sentra?

- Common symptoms include poor acceleration, rough idling, stalling, and a decrease in fuel efficiency.

2. What does the OBDII code P0122 indicate in a 2002 Nissan Sentra?

- The code indicates a low input signal from the throttle position sensor or switch '1', which can affect the vehicle's performance.

3. What are the possible causes of OBDII code P0122 in a 2002 Nissan Sentra?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors, a dirty throttle body, or a problem with the engine control module.

4. How can I diagnose the cause of OBDII code P0122 in my 2002 Nissan Sentra?

- You can use a scan tool to check the throttle position sensor's voltage readings, inspect the wiring and connectors for damage, and clean the throttle body to see if it resolves the issue.

5. Can I still drive my 2002 Nissan Sentra with OBDII code P0122 present?

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

6. How can I repair OBDII code P0122 in my 2002 Nissan Sentra?

- Repair options include replacing the throttle position sensor, repairing any damaged wiring or connectors, cleaning the throttle body, or reprogramming the engine control module.

7. Will resetting the OBDII code P0122 in my 2002 Nissan Sentra make it go away permanently?

- Resetting the code may temporarily clear the check engine light, but if the underlying issue is not addressed, the code is likely to reappear.

8. How much does it typically cost to repair OBDII code P0122 in a 2002 Nissan Sentra?

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

9. Can a DIY enthusiast fix OBDII code P0122 in a 2002 Nissan Sentra?

- Depending on the level of experience and access to tools, some DIY enthusiasts may be able to diagnose and repair the issue themselves, especially if it involves simple tasks like cleaning the throttle body.

10. Is it necessary to have OBDII code P0122 in a 2002 Nissan Sentra fixed immediately?

- While the vehicle may still be operable with the code present, addressing the issue promptly can prevent further damage and ensure optimal performance and fuel efficiency.

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