AutoCodes.com | All About OBDII Engine Codes
AutoCodes - Honda - P1128 1998 Honda Civic

P1128 1998 Honda Civic Code - Manifold Absolute Pressure Sensor Signal Lower Than Expected

- Code Popularity: 4,290 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents
Share on Facebook   Share on Twitter   Share on Linkedin

What are the Possible Causes of the DTC P1128 1998 Honda Civic?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • Engine mechanical condition
  • Faulty Manifold Absolute Pressure (MAP) sensor
  • Manifold Absolute Pressure (MAP) sensor harness is open or shorted
  • Manifold Absolute Pressure (MAP) sensor circuit poor electrical connection
⚠ Does your Honda have Safety Recalls? → Check here

How to Fix the DTC P1128 1998 Honda Civic?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

Search for P1128 1998 Honda Civic Questions and Answers: Search here →

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1128 1998 Honda Civic code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P1128 1998 Honda Civic Description

The Manifold Absolute Pressure (MAP) sensor senses manifold absolute pressure (vacuum) and converts it into electrical signals. The MAP sensor outputs low signal voltage at high-vacuum (idling) and high signal voltage at low-vacuum (throttle valve wide open).
The Engine Control Module (ECM) compares a predetermined MAP value at a given throttle position and manifold absolute pressure to the output voltage value of the MAP sensor.
If the MAP sensor outputs lower voltage than expected, the ECM detects a malfunction and stores a DTC.
OBDII Code P1128 1998 Honda Civic - Manifold Absolute Pressure Sensor Signal Lower Than Expected - AutoCodes.com
P1128 1998 Honda Civic Code - Manifold Absolute Pressure Sensor Signal Lower Than Expected

Need More Information on the Code?

Need more information on how to fix the P1128 1998 Honda Civic code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1128 1998 Honda Civic code diagnosed by a professional: Find a repair shop in your area

Code P1128 1998 Honda Civic comments

Help us improve AutoCodes.com. Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the P1128 1998 Honda Civic code? Have you replaced any parts?
Any information is appreciated. Thanks