P1128 1997 Honda Civic Code - Manifold Absolute Pressure Sensor Signal Lower Than Expected
Quick Answer
The Manifold Absolute Pressure (MAP) sensor senses manifold absolute pressure (vacuum) and converts it into electrical signals. Common causes include Engine mechanical condition, Faulty Manifold Absolute Pressure (MAP) sensor, Manifold Absolute Pressure (MAP) sensor harness is open or shorted. 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 1997 Honda Civic indicates Manifold Absolute Pressure Sensor Signal Lower Than Expected.
- Common causes
- Common causes include Engine mechanical condition, Faulty Manifold Absolute Pressure (MAP) sensor, Manifold Absolute Pressure (MAP) sensor harness is open or shorted.
- 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.
Code P1128 1997 Honda Civic Description
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.
What are the Possible Causes of the DTC P1128 1997 Honda Civic?
- 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 to Fix the DTC P1128 1997 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 P1128 1997 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.
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Frequently Asked Questions about P1128 1997 Honda Civic Code
1. What are the common symptoms of OBDII code P1128 on a 1997 Honda Civic?
- Common symptoms include reduced engine performance, poor fuel efficiency, rough idle, and potential stalling issues.
2. What could cause the Manifold Absolute Pressure Sensor signal to be lower than expected in a 1997 Honda Civic?
- Potential causes include a faulty MAP sensor, vacuum leaks in the intake system, clogged air filter, or issues with the engine's fuel system.
3. How can I diagnose the OBDII code P1128 on my 1997 Honda Civic?
- You can diagnose the code by using an OBDII scanner to retrieve the specific fault code, checking the MAP sensor for proper operation, inspecting for any visible vacuum leaks, and testing the intake system for any restrictions.
4. Is it safe to continue driving my 1997 Honda Civic with OBDII code P1128?
- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent potential engine damage and ensure optimal performance.
5. Can I repair the OBDII code P1128 on my 1997 Honda Civic myself?
- Depending on your mechanical skills, you may be able to address the issue yourself by replacing the MAP sensor, fixing any vacuum leaks, or cleaning the air filter. However, professional diagnosis and repair are recommended for accurate and long-lasting solutions.
6. How much does it typically cost to repair OBDII code P1128 on a 1997 Honda Civic?
- The cost of repair can vary depending on the underlying cause of the issue. Replacement of the MAP sensor can range from $50 to $200, while addressing vacuum leaks or other issues may incur additional costs.
7. Will resetting the OBDII code P1128 on my 1997 Honda Civic make it go away permanently?
- Resetting the code may temporarily clear the warning light, but if the underlying issue is not addressed, the code is likely to reappear. It is crucial to diagnose and repair the root cause to prevent future occurrences.
8. Can a dirty air filter trigger OBDII code P1128 on a 1997 Honda Civic?
- Yes, a clogged or dirty air filter can disrupt the proper airflow into the engine, affecting the MAP sensor's readings and potentially triggering the P1128 code.
9. How long does it typically take to repair OBDII code P1128 on a 1997 Honda Civic?
- The repair time can vary depending on the specific cause of the issue and the extent of the repairs needed. It can range from a quick sensor replacement taking less than an hour to more extensive troubleshooting and repairs taking a few hours to complete.
10. What are some preventive maintenance tips to avoid OBDII code P1128 on a 1997 Honda Civic?
- Regularly inspect and replace the air filter, check for vacuum leaks, ensure proper engine maintenance, and address any issues promptly to prevent the occurrence of the P1128 code. Regularly servicing the vehicle can help avoid potential issues.
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