P1129 2000 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 2000 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.
Code P1129 2000 Honda Civic Description
What are the Possible Causes of the DTC P1129 2000 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 2000 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 2000 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 2000 Honda Civic code?
Need more information on how to fix the P1129 2000 Honda Civic code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P1129 2000 Honda Civic code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P1129 2000 Honda Civic Code
1. What does the OBDII code P1129 on a 2000 Honda Civic indicate?
The P1129 code in a 2000 Honda Civic indicates that the Manifold Absolute Pressure (MAP) Sensor Circuit has registered a voltage higher than expected, suggesting a potential issue with the MAP sensor or its circuit.
2. What are common symptoms of the P1129 code in a 2000 Honda Civic?
Common symptoms include engine misfiring, hesitation during acceleration, rough idling, decreased fuel efficiency, and the check engine light being illuminated.
3. What could cause the P1129 code to appear on a 2000 Honda Civic?
Potential causes include a faulty MAP sensor, electrical issues like shorted or frayed wiring, vacuum leaks, or a problem with the Engine Control Module (ECM).
4. How can I troubleshoot the P1129 code in a 2000 Honda Civic?
Start by visually inspecting the MAP sensor and its connections for any obvious signs of damage or disconnection. Check the wiring for shorts or corrosion, and test the sensor's voltage with a multimeter to ensure it aligns with manufacturer specifications.
5. What steps should be taken to fix the P1129 code on a 2000 Honda Civic?
Depending on the identified issue, repairs may involve replacing the MAP sensor, repairing or replacing damaged wiring or connectors, fixing any vacuum leaks, or in some cases, reprogramming or replacing the ECM.
6. Is it safe to drive a 2000 Honda Civic with a P1129 code?
While you may be able to drive with this code, doing so can lead to reduced performance and fuel efficiency. Continuous driving with this issue can potentially lead to further engine damage, so it is advisable to address the problem promptly.
7. What tools are required to diagnose the P1129 code on a 2000 Honda Civic?
Tools needed include a digital multimeter for testing sensor voltages and continuity, a scan tool to read and clear the code, and possibly a vacuum gauge to check for leaks in the intake manifold.
8. Can a faulty MAP sensor affect the overall performance of a 2000 Honda Civic?
Yes, a faulty MAP sensor can significantly affect the engine's performance. It can alter fuel delivery and ignition timing, leading to issues like stalling, hesitation, and reduced fuel economy.
9. How often does the MAP sensor need to be replaced in a 2000 Honda Civic?
The MAP sensor doesn't have a specific replacement interval, but it should be replaced if diagnostic testing confirms it is faulty or if it is physically damaged. Regular checks during routine maintenance can help catch issues early.
10. What preventive measures can be taken to avoid the P1129 code in a 2000 Honda Civic?
Regular maintenance checks including inspecting the MAP sensor and associated wiring, keeping the engine and its components clean, and addressing any engine performance issues promptly can help prevent this code from appearing.
Discuss the causes and fixes for P1129 2000 Honda Civic OBDII Code
-
my 02 Honda 1.7 timing belt broke off 5 teeth on the timing belt then it bent intake valves. So i replaced the bent valves and put my head back on. went to start the motor and it is rough running and when i push the gas peddle it didn't have power and code p1129 came on . still runs rough and i don't know if i should put a new map sensor . Need help
-
Yes you should start by replacing the sensor. Bad sensor could cause the engine to run rough.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
