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Engine-Codes – Honda – P1128 1996 Honda Civic

P1128 1996 Honda Civic Code - Manifold Absolute Pressure Sensor Signal Lower Than Expected

Quick Answer

The P1128 diagnostic trouble code (DTC) in a 1996 Honda Civic indicates that the Manifold Absolute Pressure (MAP) sensor signal is lower than expected. Common causes include Faulty MAP sensor, Vacuum leaks in the intake system, Clogged or dirty air filter. 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 1996 Honda Civic indicates Manifold Absolute Pressure Sensor Signal Lower Than Expected.
Common causes
Common causes include Faulty MAP sensor, Vacuum leaks in the intake system, Clogged or dirty air filter.
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 12, 2024
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Code P1128 1996 Honda Civic Description

The P1128 diagnostic trouble code (DTC) in a 1996 Honda Civic indicates that the Manifold Absolute Pressure (MAP) sensor signal is lower than expected. The MAP sensor is a crucial component that measures the pressure within the intake manifold, providing essential data to the engine control module (ECM) for determining fuel injection and ignition timing. When the MAP sensor signal is lower than expected, it can lead to various performance issues in the vehicle.

OBDII Code P1128 1996 Honda Civic - Manifold Absolute Pressure Sensor Signal Lower Than Expected
P1128 1996 Honda Civic Code - Manifold Absolute Pressure Sensor Signal Lower Than Expected

Common Causes of P1128 1996 Honda Civic

  1. Faulty MAP sensor
  2. Vacuum leaks in the intake system
  3. Clogged or dirty air filter
  4. Issues with the fuel system, such as a clogged fuel filter
  5. ECM malfunctions or wiring issues

Symptoms of P1128 1996 Honda Civic

  1. Rough idling or engine misfires
  2. Poor acceleration or hesitation during acceleration
  3. Stalling or difficulty starting the engine
  4. Reduced fuel efficiency
  5. Illumination of the Check Engine Light

How to Fix P1128 1996 Honda Civic

  1. Connect a diagnostic scanner to retrieve the specific trouble code (P1128) and freeze frame data for further analysis.
  2. Inspect the MAP sensor and its wiring for any signs of damage or corrosion. Replace the MAP sensor if necessary.
  3. Check for vacuum leaks in the intake system by performing a smoke test or using a vacuum gauge. Repair any leaks found.
  4. Inspect and replace the air filter if it is clogged or dirty, restricting airflow to the engine.
  5. Verify proper fuel system operation by checking the fuel filter and fuel pressure. Replace the fuel filter if needed and ensure proper fuel pressure.

Cost to Fix P1128 1996 Honda Civic

The typical repair costs for addressing a P1128 code in a 1996 Honda Civic may range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. However, it is important to note that these estimates can vary based on factors such as location, vehicle make and model, and engine type. Additionally, diagnosis time and labor rates at auto repair shops can fluctuate, with rates typically ranging between $80 and $150 per hour. It is advisable to contact local auto repair shops for more accurate cost estimates based on individual circumstances.

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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 P1128 1996 Honda Civic Code

1. What are the common symptoms of OBDII code P1128 on a 1996 Honda Civic?

- Common symptoms of P1128 include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.

2. What are the possible causes of OBDII code P1128 in a 1996 Honda Civic?

- The most common causes of P1128 in a 1996 Honda Civic are a faulty manifold absolute pressure (MAP) sensor, vacuum leaks, or a problem with the intake system.

3. How can I diagnose the OBDII code P1128 on my 1996 Honda Civic?

- To diagnose P1128, use an OBDII scanner to retrieve the code, then inspect the MAP sensor, vacuum lines, and intake system for any signs of damage or malfunction.

4. Can I drive my 1996 Honda Civic with OBDII code P1128?

- It is not recommended to drive your vehicle with code P1128 as it can lead to further engine damage and poor performance. It's best to address the issue promptly.

5. How can I repair OBDII code P1128 on my 1996 Honda Civic?

- Repairing P1128 typically involves replacing the faulty MAP sensor, fixing any vacuum leaks, or addressing issues with the intake system, depending on the underlying cause.

6. Are there any DIY tips for fixing OBDII code P1128 on a 1996 Honda Civic?

- DIY tips for addressing P1128 include checking and cleaning the MAP sensor, inspecting vacuum lines for leaks, and ensuring the intake system is properly sealed.

7. Will resetting the OBDII codes clear P1128 on my 1996 Honda Civic?

- Resetting the codes may temporarily clear P1128, but if the underlying issue is not addressed, the code is likely to reappear. It's crucial to diagnose and repair the root cause.

8. Can a dirty air filter trigger OBDII code P1128 in a 1996 Honda Civic?

- A dirty air filter can indirectly affect the MAP sensor readings, potentially leading to P1128. Regularly changing the air filter can help prevent such issues.

9. Is OBDII code P1128 a serious issue in a 1996 Honda Civic?

- While P1128 may not cause immediate breakdown, it can impact your vehicle's performance and fuel efficiency. Ignoring the code can lead to more significant problems over time.

10. How much does it typically cost to repair OBDII code P1128 on a 1996 Honda Civic?

- The cost to repair P1128 can vary depending on the exact cause and parts needed. On average, expect to spend anywhere from $100 to $300 for parts and labor.

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