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Engine-Codes – Honda – P0122 1998 Honda Civic

P0122 1998 Honda Civic Code - Throttle Position Sensor 'A' Circuit Low Voltage

Quick Answer

The P0122 diagnostic trouble code (DTC) in a 1998 Honda Civic indicates an issue with the Throttle Position Sensor (TPS) 'A' Circuit registering low voltage. Common causes include A malfunctioning Throttle Position Sensor (TPS), Damaged or corroded wiring/connectors in the TPS circuit, Issues with the ECM receiving and interpreting TPS data. 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 1998 Honda Civic indicates Throttle Position Sensor 'A' Circuit Low Voltage.
Common causes
Common causes include A malfunctioning Throttle Position Sensor (TPS), Damaged or corroded wiring/connectors in the TPS circuit, Issues with the ECM receiving and interpreting TPS data.
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 P0122 1998 Honda Civic Description

The P0122 diagnostic trouble code (DTC) in a 1998 Honda Civic indicates an issue with the Throttle Position Sensor (TPS) 'A' Circuit registering low voltage. The 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 adjust fuel delivery and ignition timing for optimal engine performance.

OBDII Code P0122 1998 Honda Civic - Throttle Position Sensor 'A' Circuit Low Voltage
P0122 1998 Honda Civic Code - Throttle Position Sensor 'A' Circuit Low Voltage

Common Causes of P0122 1998 Honda Civic

  1. A malfunctioning Throttle Position Sensor (TPS).
  2. Damaged or corroded wiring/connectors in the TPS circuit.
  3. Issues with the ECM receiving and interpreting TPS data.
  4. Contamination or debris affecting TPS performance.
  5. Electrical issues such as a blown fuse related to the TPS circuit.

Symptoms of P0122 1998 Honda Civic

  1. Poor acceleration or hesitation when pressing the gas pedal.
  2. Rough idling or stalling when the vehicle is at a stop.
  3. Decreased fuel efficiency, leading to more frequent refueling.
  4. Difficulty starting the engine, especially in cold weather.
  5. Illumination of the check engine light on the dashboard.

How to Fix P0122 1998 Honda Civic

  1. Begin by diagnosing the TPS using a multimeter to check for proper voltage output.
  2. Inspect the wiring and connectors in the TPS circuit for any damage or corrosion.
  3. If the TPS is faulty, replace it with a new, OEM-quality sensor.
  4. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the issue is resolved.
  5. If the problem persists, further diagnostics may be required to identify any underlying ECM issues or other related problems.

Cost to Fix P0122 1998 Honda Civic

The cost of repairing a Throttle Position Sensor 'A' Circuit Low Voltage issue in a 1998 Honda Civic can vary depending on the specific components that need to be replaced and the labor rates in your area. On average, replacing a TPS sensor can cost between $50 to $200, while the labor cost for this repair may range from $100 to $200. Keep in mind that additional diagnostic time or parts replacement may increase the overall repair cost. It is recommended to consult with a trusted mechanic or auto repair shop to get an accurate estimate based on your vehicle's specific needs.

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 1998 Honda Civic Code

1. What are the common symptoms of OBDII code P0122 in a 1998 Honda Civic?

- Common symptoms include rough idling, poor acceleration, stalling, and potential issues with shifting gears.

2. What is the main cause of OBDII code P0122 in a 1998 Honda Civic?

- The main cause is usually a malfunctioning throttle position sensor (TPS), leading to low voltage in the 'A' circuit.

3. How can I diagnose the throttle position sensor in a 1998 Honda Civic with OBDII code P0122?

- Use a multimeter to test the TPS for proper voltage output and check for any loose or damaged wiring connections.

4. Can a dirty throttle body cause OBDII code P0122 in a 1998 Honda Civic?

- Yes, a dirty throttle body can cause incorrect readings from the TPS, triggering the low voltage error code.

5. What are some repair tips for fixing OBDII code P0122 in a 1998 Honda Civic?

- Try cleaning the throttle body, inspecting the TPS wiring, and if necessary, replacing the throttle position sensor to resolve the issue.

6. Is it safe to continue driving a 1998 Honda Civic with OBDII code P0122?

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

7. Can resetting the OBDII code P0122 in a 1998 Honda Civic make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue like a faulty TPS persists, the code is likely to reappear.

8. How much does it typically cost to replace a throttle position sensor in a 1998 Honda Civic?

- The cost of replacing a throttle position sensor can vary, but it usually ranges from $100 to $200, including parts and labor.

9. Are there any preventative measures to avoid OBDII code P0122 in a 1998 Honda Civic?

- Regular maintenance, such as cleaning the throttle body and checking the TPS wiring during tune-ups, can help prevent issues that trigger this error code.

10. Can a DIY enthusiast fix OBDII code P0122 in a 1998 Honda Civic, or is professional help necessary?

- Depending on your skill level and tools available, some DIY enthusiasts may be able to replace the throttle position sensor themselves. However, if unsure, it's best to seek professional help to ensure proper diagnosis and repair.

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