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P1128 Acura Code - Manifold Absolute Pressure Sensor Signal Lower Than Expected

Quick Answer

The P1128 code in Acura vehicles indicates that the Manifold Absolute Pressure (MAP) sensor is reporting a signal that is lower than expected by the engine control module. Common causes include Faulty MAP sensor, Vacuum leak in the intake manifold, 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 Acura indicates Manifold Absolute Pressure Sensor Signal Lower Than Expected.
Common causes
Common causes include Faulty MAP sensor, Vacuum leak in the intake manifold, 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 10, 2024
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Code P1128 Acura Description

The P1128 code in Acura vehicles indicates that the Manifold Absolute Pressure (MAP) sensor is reporting a signal that is lower than expected by the engine control module. The MAP sensor is a crucial component in the engine management system, as it measures the intake manifold pressure and provides this data to the ECU for optimal fuel delivery and ignition timing. When the signal from the MAP sensor is lower than expected, it can lead to a variety of performance issues and potentially cause long-term damage if left unaddressed.

OBDII Code P1128 Acura - Manifold Absolute Pressure Sensor Signal Lower Than Expected
P1128 Acura Code - Manifold Absolute Pressure Sensor Signal Lower Than Expected

Common Causes of P1128 Acura

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

Symptoms of P1128 Acura

  1. Poor acceleration and decreased engine performance
  2. Rough idling or stalling
  3. Decreased fuel efficiency
  4. Check Engine Light illuminated on the dashboard

How to Fix P1128 Acura

  1. Use an OBD-II scanner to confirm the P1128 code and ensure it is related to the MAP sensor.
  2. Inspect the MAP sensor and its wiring for any visible damage or corrosion.
  3. Test the MAP sensor using a multimeter to check for proper voltage output.
  4. Check for vacuum leaks in the intake manifold and repair as necessary.
  5. Replace the MAP sensor if it is determined to be faulty or damaged.

Cost to Fix P1128 Acura

The cost of repairing a P1128 code in an Acura vehicle can vary depending on the specific cause of the issue and the labor rates in your area. On average, replacing a MAP sensor can cost between $100 and $300, including parts and labor. Additional costs may be incurred if there are other components that need to be repaired or replaced. It is recommended to consult with a mechanic or dealership for a more accurate estimate based on your vehicle's make and model.

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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 Acura Code

What does the OBDII code P1128 mean for an Acura?

The code P1128 indicates that the Manifold Absolute Pressure (MAP) sensor is detecting a signal that is lower than expected, which may affect engine performance.

What are the common symptoms of code P1128 in an Acura?

Symptoms may include poor acceleration, rough idling, reduced fuel efficiency, and possibly an illuminated check engine light.

What causes the P1128 code to appear?

Common causes include a faulty MAP sensor, vacuum leaks, damaged wiring or connectors, or issues with the engine control module (ECM).

Can a dirty air filter trigger the P1128 code?

Yes, a clogged air filter can restrict airflow, potentially leading to inaccurate readings from the MAP sensor.

How do you diagnose the P1128 code in an Acura?

Diagnosis typically involves inspecting the MAP sensor, checking for vacuum leaks, testing sensor voltage, and examining the wiring and connectors for damage.

Is it safe to drive with the P1128 code active?

While the vehicle may still be drivable, operating with this code can lead to reduced performance and potential engine damage if left unresolved.

How can you fix the P1128 code?

Repairs may include replacing the MAP sensor, repairing damaged wiring or connectors, fixing vacuum leaks, or cleaning the throttle body.

How much does it cost to repair the P1128 code?

Repair costs vary depending on the issue, but replacing a MAP sensor typically costs between $100 and $300, including parts and labor.

Can an aftermarket MAP sensor cause the P1128 code?

Yes, a low-quality aftermarket MAP sensor may provide inaccurate readings, potentially triggering this code.

How often should the MAP sensor be replaced to avoid issues like P1128?

MAP sensors are generally designed to last the lifetime of the vehicle but should be inspected and replaced if they show signs of failure.

Discuss the causes and fixes for P1128 Acura OBDII Code

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