The OBD code P1129 for Honda indicates an issue with the Manifold Absolute Pressure Sensor (MAP).
Symptoms include the Engine Light ON, hard starting, and rough idle.
Causes may include a faulty MAP sensor, wiring harness issues, or poor electrical connections.
This is a moderate issue that can affect engine performance.
To fix, inspect the sensor, wiring, and connectors for any damage or poor connections.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 6.67 (Out of 10) |
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Symptoms of the Honda p1129 OBD Code
The vehicle may experience poor acceleration and reduced engine performance with Honda fault code P1129.
- Symptoms for Honda OBD code P1129 include: Engine Light ON.
- Engine hard to start.
- Rough or erratic idle speed.
Causes of the Honda p1129 OBD Code
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P1129 in a Honda indicates an issue with the MAP sensor circuit or vacuum leak.
- P1129 can be caused by a Faulty Manifold Absolute Pressure Sensor.
- A Manifold Absolute Pressure Sensor harness that is open or shorted.
- A Manifold Absolute Pressure Sensor circuit with poor electrical connection.
Fixing Honda Error Code p1129 Step By Step
Address the issue by inspecting the throttle position sensor and related wiring for faults or damage.
- To fix Honda OBDII code P1129, start by reviewing the possible causes mentioned above.
- Visually examine the corresponding wiring harness and connectors for any damage.
- Check the connector pins for signs of being broken, bent, pushed out, or corroded.
- Inspect the throttle position sensor (TPS) for proper operation and connection.
- Clean the throttle body and idle air control valve to ensure they are functioning correctly.
- Reset the engine control module (ECM) to clear the fault code and see if it returns.
- If the issue persists, consider replacing the TPS or the ECM as needed.
Cost Of Fixing Honda p1129 Fault Code
Diagnosing and repairing Honda code P1129 may involve inspecting and replacing the thermostat.
The cost to diagnose and fix a Honda OBD code P1129 typically ranges from $75 to $150 per hour for labor rates.
With an estimated repair time of 1. 0 hour, the total cost could be around $75 to $150, depending on shop rates and the complexity of the issue.
Details of the Honda p1129 OBD Code
Code P1129 on a Honda indicates an issue with the downstream O2 sensor.
Code P1129 on a Honda vehicle indicates an issue with the downstream heated oxygen sensor (HO2S) on bank 1. This sensor is responsible for monitoring the efficiency of the catalytic converter.
The Engine Control Module (ECM) triggers this code when it detects that the downstream HO2S signal is too high for too long, indicating a potential problem with the catalytic converter or the sensor itself.
This code is related to the fuel control system and is crucial for maintaining proper emissions levels.
Mechanic’s Tech Notes
Detailed information on Honda fault code P1129, including symptoms, causes, and solutions for effective troubleshooting.
To diagnose and fix OBDII code P1129 on a Honda, start by checking the throttle position sensor (TPS) for proper operation.
Use a voltmeter to test the TPS voltage signal at different throttle positions.
Ensure the TPS is securely mounted and the wiring is intact.
Next, inspect the intake air system for any leaks or restrictions that could affect sensor readings.
Additionally, check the idle air control valve (IAC) for proper functioning.
Resetting the throttle position may be necessary using a scan tool.
If the issue persists, consider replacing the TPS or performing a throttle body cleaning.
FAQ
Common symptoms of OBD code P1129 in a Honda: Engine Light ON, hard starting, rough idle. Causes: Faulty MAP sensor or wiring issues. Fix: Inspect sensor and wiring for damage.
OBD code P1129 in a Honda is typically caused by a faulty Manifold Absolute Pressure Sensor, open/shorted harness, or poor electrical connection. Inspect and repair as needed.
Diagnose P1129 in Honda: Check Manifold Absolute Pressure Sensor and wiring for faults. Inspect connectors for damage or corrosion. Fix as needed.
Wrap Up
If your Honda is displaying OBD code P1129 along with poor acceleration and high fuel consumption, it may indicate an issue with the Manifold Absolute Pressure (MAP) sensor, intake air leaks, or a faulty EGR valve.
These components play a crucial role in regulating air intake and fuel mixture, affecting engine performance.
To address Honda OBD code P1129, start by checking the MAP sensor for proper operation and inspecting the intake system for any leaks.
Ensure the EGR valve is functioning correctly and test the wiring harness and connectors for any damage or loose connections that could be affecting sensor
