AutoCodes – Honda – P1129 1996 Honda Civic

P1129 1996 Honda Civic Code - Manifold Absolute Pressure Sensor Circuit Higher Than Expected

Quick Answer

The Manifold Αbsolute Pressure (MΑP) sensor generates a signal that is proportional to the amount of vacuum in the intake manifold. Common causes include Faulty Manifold Absolute Pressure Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure Sensor circuit poor electrical connection. 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: P1129 1996 Honda Civic indicates Manifold Absolute Pressure Sensor Circuit Higher Than Expected.
Common causes: Common causes include Faulty Manifold Absolute Pressure Sensor, Manifold Absolute Pressure Sensor harness is open or shorted, Manifold Absolute Pressure Sensor circuit poor electrical connection.
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.

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Code Popularity 2,902

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 27, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1129 1996 Honda Civic Description

The Manifold Αbsolute Pressure (MΑP) sensor generates a signal that is proportional to the amount of vacuum in the intake manifold. The signal is sent to the Engine Control Mudule (ECM) and the information is used to control the air/fuel mixture ratio. Faulty MΑP sensor can cuase the engine to stall, surge or a rough idle.

OBDII Code P1129 1996 Honda Civic - Manifold Absolute Pressure Sensor Circuit Higher Than Expected - AutoCodes.com — P1129 1996 Honda Civic Code - Manifold Absolute Pressure Sensor Circuit Higher Than Expected

What does this mean?

What are the Possible Causes of the DTC P1129 1996 Honda Civic?

Faulty Manifold Absolute Pressure Sensor
Manifold Absolute Pressure Sensor harness is open or shorted
Manifold Absolute Pressure Sensor circuit poor electrical connection

How to Fix the DTC P1129 1996 Honda Civic?

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

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1129 1996 Honda Civic code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P1129 1996 Honda Civic code?

Need more information on how to fix the P1129 1996 Honda Civic code? Get Access to Factory Service Manuals

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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 P1129 1996 Honda Civic Code

1. What are the common symptoms of OBDII code P1129 in a 1996 Honda Civic?

The common symptoms of code P1129 in a 1996 Honda Civic include poor engine performance, rough idling, decreased fuel efficiency, and potential stalling.

2. What does the OBDII code P1129 indicate for a 1996 Honda Civic?

Code P1129 on a 1996 Honda Civic indicates that the Manifold Absolute Pressure (MAP) sensor circuit is detecting a higher than expected voltage signal.

3. What are the possible causes of OBDII code P1129 in a 1996 Honda Civic?

Possible causes of code P1129 in a 1996 Honda Civic include a faulty MAP sensor, a vacuum leak in the intake system, a clogged air filter, or issues with the wiring or connectors related to the MAP sensor.

4. How can I diagnose the OBDII code P1129 in my 1996 Honda Civic?

To diagnose code P1129 in a 1996 Honda Civic, you can use an OBDII scanner to read the code and check the MAP sensor's voltage readings. Additionally, inspect the intake system for any leaks and ensure the air filter is clean.

5. Can I continue driving my 1996 Honda Civic with OBDII code P1129?

It is not recommended to continue driving your 1996 Honda Civic with code P1129, as it can lead to further engine damage and decreased performance. It's best to address the issue promptly.

6. How do I repair OBDII code P1129 in my 1996 Honda Civic?

To repair code P1129 in a 1996 Honda Civic, you may need to replace the faulty MAP sensor, fix any vacuum leaks, clean or replace the air filter, and check the wiring and connectors for any issues.

7. Can a DIY enthusiast fix OBDII code P1129 in a 1996 Honda Civic?

Depending on your skill level and access to tools, a DIY enthusiast may be able to fix code P1129 in a 1996 Honda Civic by following a repair manual or online guides. However, if unsure, it's best to consult a professional mechanic.

8. How much does it cost to fix OBDII code P1129 in a 1996 Honda Civic?

The cost to fix code P1129 in a 1996 Honda Civic can vary depending on the specific issue causing the code. Replacing a MAP sensor can range from $50 to $200, while addressing vacuum leaks or wiring problems may incur additional costs.

9. Will resetting the OBDII code P1129 in my 1996 Honda Civic make it go away?

Resetting the OBDII code P1129 in a 1996 Honda Civic may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's essential to diagnose and fix the root cause of the problem.

10. How long does it typically take to repair OBDII code P1129 in a 1996 Honda Civic?

The repair time for code P1129 in a 1996 Honda Civic can vary based on the specific cause and the extent of the repairs needed. It can take anywhere from 1-3 hours for a professional mechanic to diagnose and fix the issue.