P1128 2009 Honda Accord 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 2009 Honda Accord 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 2009 Honda Accord 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 2009 Honda Accord?
- 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 2009 Honda Accord?
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 2009 Honda Accord 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 2009 Honda Accord Code
1. What are the common symptoms of OBDII code P1128 on a 2009 Honda Accord?
- Common symptoms include reduced engine performance, poor fuel economy, rough idling, and potential stalling.
2. What does the OBDII code P1128 in a 2009 Honda Accord indicate?
- The code P1128 indicates that the Manifold Absolute Pressure (MAP) sensor is detecting a signal lower than expected by the engine control module.
3. What are the possible causes of OBDII code P1128 on a 2009 Honda Accord?
- Possible causes include a faulty MAP sensor, vacuum leaks, clogged air filter, intake manifold issues, or wiring/connectivity problems.
4. How can I diagnose the cause of OBDII code P1128 on my 2009 Honda Accord?
- Diagnosing the issue may involve checking the MAP sensor's voltage output, inspecting for vacuum leaks, testing the intake manifold, and examining the air filter condition.
5. Can I continue driving my 2009 Honda Accord with OBDII code P1128?
- It is not recommended to drive with this code present, as it can lead to further engine damage and worsen fuel efficiency over time.
6. How can I repair OBDII code P1128 on my 2009 Honda Accord?
- Repair options may include replacing the MAP sensor, fixing any vacuum leaks, cleaning or replacing the air filter, addressing intake manifold issues, or repairing wiring/connectivity problems.
7. Will resetting the OBDII code P1128 in my 2009 Honda Accord make it go away permanently?
- Resetting the code may temporarily turn off the Check Engine light, but if the underlying issue is not addressed, the code is likely to reappear.
8. Is it possible to prevent OBDII code P1128 from occurring in my 2009 Honda Accord?
- Regular maintenance, such as checking and replacing air filters, inspecting vacuum lines, and ensuring proper MAP sensor function, can help prevent this code from occurring.
9. Can a DIY enthusiast fix OBDII code P1128 on a 2009 Honda Accord?
- Depending on the individual's skill level and access to tools, some may be able to diagnose and repair the issue themselves. However, it is recommended to seek professional help for accurate diagnosis and proper repair.
10. How much should I expect to pay to fix OBDII code P1128 on my 2009 Honda Accord?
- The cost of repairs can vary depending on the root cause of the issue, but it is advisable to budget for potential expenses related to MAP sensor replacement, vacuum leak repairs, or other necessary parts and labor.
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