Engine-Codes.com
Engine-Codes – Honda – P1128 1997 Honda Civic

P1128 1997 Honda Civic Code - Manifold Absolute Pressure Sensor Signal Lower Than Expected

Quick Answer

The P1128 code on a 1997 Honda Civic indicates that the Manifold Absolute Pressure (MAP) sensor signal is lower than expected by the Engine Control Module (ECM). Common causes include Faulty MAP sensor, Vacuum leak in the intake system, Clogged or dirty MAP 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
P1128 1997 Honda Civic indicates Manifold Absolute Pressure Sensor Signal Lower Than Expected.
Common causes
Common causes include Faulty MAP sensor, Vacuum leak in the intake system, Clogged or dirty MAP 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 17, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P1128 1997 Honda Civic Description

The P1128 code on a 1997 Honda Civic indicates that the Manifold Absolute Pressure (MAP) sensor signal is lower than expected by the Engine Control Module (ECM). The MAP sensor measures the pressure within the intake manifold and provides this information to the ECM to calculate the air-fuel mixture required for efficient combustion. When the sensor signal is lower than expected, it can lead to a variety of performance issues in the vehicle.

OBDII Code P1128 1997 Honda Civic - Manifold Absolute Pressure Sensor Signal Lower Than Expected
P1128 1997 Honda Civic Code - Manifold Absolute Pressure Sensor Signal Lower Than Expected

Common Causes of P1128 1997 Honda Civic

  1. Faulty MAP sensor
  2. Vacuum leak in the intake system
  3. Clogged or dirty MAP sensor
  4. Wiring or connector issues related to the sensor
  5. ECM software issues

Symptoms of P1128 1997 Honda Civic

  1. Poor engine performance
  2. Reduced fuel efficiency
  3. Rough idling
  4. Hesitation during acceleration
  5. Engine stalling

How to Fix P1128 1997 Honda Civic

  1. Begin by conducting a visual inspection of the MAP sensor, wiring, and connectors to check for any obvious signs of damage or wear.
  2. Use a multimeter to test the MAP sensor's voltage output to determine if it is within the manufacturer's specified range.
  3. Check for any vacuum leaks in the intake system and repair or replace any damaged hoses or components.
  4. Clean the MAP sensor with a specialized sensor cleaner to remove any dirt or debris that may be affecting its performance.
  5. If necessary, replace the MAP sensor with a new, OEM-quality part to ensure proper functioning.

Cost to Fix P1128 1997 Honda Civic

The typical repair costs for addressing a P1128 code on a 1997 Honda Civic can vary depending on the specific cause of the issue. In general, the cost of a new MAP sensor can range from $50 to $150, while labor costs for diagnosis and repair can range from $100 to $300. Overall, the total repair cost for this issue may fall between $150 and $450. It's important to note that these estimates are rough averages, and actual costs may vary based on factors such as location, vehicle make and model, and the rates charged by individual auto repair shops. It's recommended to obtain quotes from local shops to get a more accurate estimate for this repair.

Need more information about the P1128 1997 Honda Civic code?

Need more information on how to fix the P1128 1997 Honda Civic code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1128 1997 Honda Civic code diagnosed by a professional: Find a repair shop in your area

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 P1128 1997 Honda Civic Code

1. What are the common symptoms of OBDII code P1128 on a 1997 Honda Civic?

- Common symptoms include reduced engine performance, poor fuel efficiency, rough idle, and potential stalling issues.

2. What could cause the Manifold Absolute Pressure Sensor signal to be lower than expected in a 1997 Honda Civic?

- Potential causes include a faulty MAP sensor, vacuum leaks in the intake system, clogged air filter, or issues with the engine's fuel system.

3. How can I diagnose the OBDII code P1128 on my 1997 Honda Civic?

- You can diagnose the code by using an OBDII scanner to retrieve the specific fault code, checking the MAP sensor for proper operation, inspecting for any visible vacuum leaks, and testing the intake system for any restrictions.

4. Is it safe to continue driving my 1997 Honda Civic with OBDII code P1128?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent potential engine damage and ensure optimal performance.

5. Can I repair the OBDII code P1128 on my 1997 Honda Civic myself?

- Depending on your mechanical skills, you may be able to address the issue yourself by replacing the MAP sensor, fixing any vacuum leaks, or cleaning the air filter. However, professional diagnosis and repair are recommended for accurate and long-lasting solutions.

6. How much does it typically cost to repair OBDII code P1128 on a 1997 Honda Civic?

- The cost of repair can vary depending on the underlying cause of the issue. Replacement of the MAP sensor can range from $50 to $200, while addressing vacuum leaks or other issues may incur additional costs.

7. Will resetting the OBDII code P1128 on my 1997 Honda Civic make it go away permanently?

- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the root cause to prevent future occurrences.

8. Can a dirty air filter trigger OBDII code P1128 on a 1997 Honda Civic?

- Yes, a clogged or dirty air filter can disrupt the proper airflow into the engine, affecting the MAP sensor's readings and potentially triggering the P1128 code.

9. How long does it typically take to repair OBDII code P1128 on a 1997 Honda Civic?

- The repair time can vary depending on the specific cause of the issue and the extent of the repairs needed. It can range from a quick sensor replacement taking less than an hour to more extensive troubleshooting and repairs taking a few hours to complete.

10. What are some preventive maintenance tips to avoid OBDII code P1128 on a 1997 Honda Civic?

- Regularly inspect and replace the air filter, check for vacuum leaks, ensure proper engine maintenance, and address any issues promptly to prevent the occurrence of the P1128 code. Regularly servicing the vehicle can help avoid potential issues.

Discuss the causes and fixes for P1128 1997 Honda Civic OBDII Code

Submit a New Comment

Code P1128 1997 Honda Civic comments

No comments found for this page.