Engine-Codes - Honda - P1128 1998 HONDA CIVIC

P1128 1998 HONDA CIVIC - Manifold Absolute Pressure Sensor Signal Lower Than Expected

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What is this?
Table of contents

P1128 1998 HONDA CIVIC Possible 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

How is the P1128 1998 HONDA CIVIC code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P1128 1998 HONDA CIVIC code

Labor: 1.0

The cost to diagnose the P1128 1998 HONDA CIVIC code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.

Possible Symptoms

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

P1128 1998 HONDA CIVIC Meaning

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.

More Information

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