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Engine-Codes – Honda – P0123 1998 Honda Civic

P0123 1998 Honda Civic Code - Throttle Position Sensor/Switch 'A' Circuit High Voltage

Quick Answer

The P0123 diagnostic trouble code (DTC) for a 1998 Honda Civic indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit registering high voltage. Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or contamination in the TPS sensor. 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 1998 Honda Civic indicates Throttle Position Sensor/Switch 'A' Circuit High Voltage.
Common causes
Common causes include Faulty throttle position sensor, Damaged wiring or connectors in the TPS circuit, Corrosion or contamination in the TPS sensor.
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 P0123 1998 Honda Civic Description

The P0123 diagnostic trouble code (DTC) for a 1998 Honda Civic indicates an issue with the Throttle Position Sensor/Switch 'A' Circuit registering high voltage. The throttle position sensor (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 engine control unit (ECU). The ECU uses this data to adjust fuel delivery and ignition timing, optimizing engine performance and fuel efficiency.

OBDII Code P0123 1998 Honda Civic - Throttle Position Sensor/Switch 'A' Circuit High Voltage
P0123 1998 Honda Civic Code - Throttle Position Sensor/Switch 'A' Circuit High Voltage

Common Causes of P0123 1998 Honda Civic

  1. Faulty throttle position sensor
  2. Damaged wiring or connectors in the TPS circuit
  3. Corrosion or contamination in the TPS sensor
  4. Issues with the ECU or other related components
  5. Environmental factors such as extreme temperatures affecting sensor performance

Symptoms of P0123 1998 Honda Civic

  1. Rough idling or fluctuating idle speed
  2. Stalling or difficulty starting the engine
  3. Hesitation or lack of response when accelerating
  4. Poor fuel efficiency
  5. Check engine light illuminated on the dashboard

How to Fix P0123 1998 Honda Civic

  1. Begin by diagnosing the issue using a scan tool to confirm the P0123 code and check for any other related codes.
  2. Inspect the throttle position sensor, wiring, and connectors for any visible damage or corrosion. Clean or replace as necessary.
  3. Test the TPS using a multimeter to ensure it is functioning within specifications. Replace the sensor if it is out of range.
  4. Clear the DTC and reset the ECU to see if the code returns. Test drive the vehicle to verify that the symptoms have been resolved.
  5. If the issue persists, further diagnostics may be required to identify any underlying issues with the ECU or other components in the TPS circuit.

Cost to Fix P0123 1998 Honda Civic

The typical repair costs for addressing a P0123 code on a 1998 Honda Civic can vary depending on the specific cause of the issue. Replacement of the throttle position sensor itself can range from $50 to $150, while labor costs may add an additional $50 to $100. If wiring or connectors need to be repaired or replaced, this could increase the total repair cost. Overall, the total repair cost for addressing a P0123 code could range from $100 to $300, including parts and labor. 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. Labor rates at auto repair shops typically range from $80 to $150 per hour, but rates may vary based on location and other factors.

When is the Code Detected?

An excessively high 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 P0123 1998 Honda Civic Code

1. What are the common symptoms of OBDII code P0123 on a 1998 Honda Civic?

- Common symptoms include issues with acceleration, engine stalling, rough idling, and poor fuel efficiency.

2. What does the OBDII code P0123 indicate on a 1998 Honda Civic?

- The code indicates a high voltage condition in the throttle position sensor or switch 'A' circuit.

3. What are the possible causes of OBDII code P0123 on a 1998 Honda Civic?

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

4. How can I diagnose the throttle position sensor/sensor 'A' circuit high voltage issue on my 1998 Honda Civic?

- You can use a multimeter to test the throttle position sensor's voltage output, check the wiring for any damage, and inspect the connectors for proper connection.

5. Can I continue to drive my 1998 Honda Civic with OBDII code P0123?

- It is not recommended to drive the vehicle with this code as it can lead to performance issues and potential damage to other engine components.

6. How can I repair OBDII code P0123 on my 1998 Honda Civic?

- Repair options 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 OBDII code P0123 on a 1998 Honda Civic without fixing the underlying issue?

- While clearing the code may temporarily turn off the check engine light, the issue will likely reappear until the root cause is addressed.

8. Can a DIY enthusiast fix OBDII code P0123 on a 1998 Honda Civic?

- Depending on your skill level and access to tools, you may be able to replace the throttle position sensor or check the wiring yourself. However, professional diagnosis and repair might be more reliable.

9. How much does it cost to repair OBDII code P0123 on a 1998 Honda Civic at a mechanic?

- Repair costs can vary depending on the exact cause of the issue, but expect to pay for parts and labor, which could range from $100 to $300 or more.

10. Will fixing OBDII code P0123 improve the overall performance of my 1998 Honda Civic?

- Yes, addressing the high voltage issue in the throttle position sensor circuit should help restore normal engine performance, leading to smoother acceleration and better fuel efficiency.

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