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Engine-Codes – Honda – P1122 1999 Honda Civic

P1122 1999 Honda Civic Code - Throttle Position Sensor Signal Higher Than Expected

Quick Answer

The P1122 diagnostic trouble code (DTC) for a 1999 Honda Civic indicates that the throttle position sensor (TPS) signal is higher than expected by the engine control module (ECM). Common causes include Faulty throttle position sensor, Wiring or connector issues, Dirty throttle body. 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
P1122 1999 Honda Civic indicates Throttle Position Sensor Signal Higher Than Expected.
Common causes
Common causes include Faulty throttle position sensor, Wiring or connector issues, Dirty throttle body.
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 17, 2024
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Code P1122 1999 Honda Civic Description

The P1122 diagnostic trouble code (DTC) for a 1999 Honda Civic indicates that the throttle position sensor (TPS) signal is higher than expected by the engine control module (ECM). The TPS is a crucial component of the engine management system, as it monitors the position of the throttle valve and sends this information to the ECM. The ECM uses this data to adjust fuel delivery and ignition timing, ensuring optimal engine performance and efficiency.

OBDII Code P1122 1999 Honda Civic - Throttle Position Sensor Signal Higher Than Expected
P1122 1999 Honda Civic Code - Throttle Position Sensor Signal Higher Than Expected

Common Causes of P1122 1999 Honda Civic

  1. Faulty throttle position sensor
  2. Wiring or connector issues
  3. Dirty throttle body
  4. Malfunctioning engine control module
  5. Intermittent electrical connection

Symptoms of P1122 1999 Honda Civic

  1. Rough idling
  2. Hesitation during acceleration
  3. Poor fuel economy
  4. Stalling
  5. Limp mode activation

How to Fix P1122 1999 Honda Civic

  1. Begin by conducting a thorough inspection of the throttle position sensor, wiring, and connectors for any visible damage or corrosion.
  2. Test the throttle position sensor using a multimeter to verify its functionality and determine if it is within specifications.
  3. Clean the throttle body to remove any carbon buildup that may be affecting sensor readings.
  4. If the throttle position sensor is faulty, replace it with a new, OEM-quality sensor to ensure proper operation.
  5. Clear the DTC and perform a test drive to verify that the issue has been resolved.

Cost to Fix P1122 1999 Honda Civic

The typical repair costs for addressing a P1122 code on a 1999 Honda Civic can vary depending on the specific cause of the issue. In general, replacing a faulty throttle position sensor can range from $50 to $200, while cleaning the throttle body may cost around $50 to $100. Labor costs can add an additional $80 to $150 per hour, with the total repair bill potentially amounting to $200 to $500. It is advisable to consult with a trusted mechanic or auto repair shop to obtain a more accurate estimate based on the specific circumstances of the vehicle.

What does this mean?

Tech Notes for P1122 1999 Honda Civic

You can try to clean the throttle body but in many case the throttle body will have to be replaced.

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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 P1122 1999 Honda Civic Code

1. What are the common symptoms of OBDII code P1122 in a 1999 Honda Civic?

- Common symptoms include poor engine performance, hesitation or stalling, rough idling, and potential issues with acceleration.

2. What does the OBDII code P1122 in a 1999 Honda Civic indicate?

- The code P1122 indicates that the throttle position sensor signal is higher than expected, suggesting a potential issue with the sensor or its wiring.

3. What are the possible causes of OBDII code P1122 in a 1999 Honda Civic?

- Possible causes include a faulty throttle position sensor, damaged wiring or connectors related to the sensor, or a problem with the sensor's calibration.

4. How can I diagnose the OBDII code P1122 in a 1999 Honda Civic?

- Diagnosis typically involves using a scan tool to retrieve the trouble code, inspecting the throttle position sensor and its connections, and testing the sensor's output voltage.

5. Can I drive my 1999 Honda Civic with OBDII code P1122?

- It is not recommended to drive the vehicle with this code present, as it can lead to poor performance and potential safety issues. It's best to address the problem promptly.

6. How can I repair OBDII code P1122 in a 1999 Honda Civic?

- Repair may involve replacing the throttle position sensor, repairing or replacing damaged wiring, or recalibrating the sensor according to manufacturer specifications.

7. Is it possible to reset OBDII code P1122 in a 1999 Honda Civic without fixing the underlying issue?

- While you can clear the trouble code with a scan tool, it is not advisable as the issue will likely recur if the root cause is not addressed.

8. How much does it cost to fix OBDII code P1122 in a 1999 Honda Civic?

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

9. Can a DIY enthusiast fix OBDII code P1122 in a 1999 Honda Civic?

- If you have experience working on cars and the necessary tools, you may be able to replace the throttle position sensor yourself. However, it's important to ensure proper diagnosis and installation.

10. How long does it take to repair OBDII code P1122 in a 1999 Honda Civic?

- The repair time can vary based on the extent of the issue and your experience level. Typically, it may take anywhere from 1 to 3 hours to diagnose and fix the problem.

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