P1129 2008 Honda Accord Code - Manifold Absolute Pressure Sensor Circuit Higher Than Expected
Quick Answer
The P1129 code in a 2008 Honda Accord indicates that the Manifold Absolute Pressure (MAP) sensor circuit is reading a higher voltage than expected by the Engine Control Module (ECM). Common causes include Faulty MAP sensor, Damaged or corroded wiring in the sensor circuit, Vacuum leak in the intake manifold. 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 2008 Honda Accord indicates Manifold Absolute Pressure Sensor Circuit Higher Than Expected.
- Common causes
- Common causes include Faulty MAP sensor, Damaged or corroded wiring in the sensor circuit, Vacuum leak in the intake manifold.
- 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 P1129 2008 Honda Accord Description
The P1129 code in a 2008 Honda Accord indicates that the Manifold Absolute Pressure (MAP) sensor circuit is reading a higher voltage than expected by the Engine Control Module (ECM). The MAP sensor plays a crucial role in the engine management system, as it measures the pressure within the intake manifold and provides this data to the ECM. This information is essential for the ECM to calculate the correct air-fuel mixture for optimal engine performance.
Common Causes of P1129 2008 Honda Accord
- Faulty MAP sensor
- Damaged or corroded wiring in the sensor circuit
- Vacuum leak in the intake manifold
- ECM malfunction
- Incorrectly installed aftermarket performance parts affecting the MAP sensor readings
Symptoms of P1129 2008 Honda Accord
- Decreased fuel efficiency
- Rough idling or stalling
- Engine hesitation or surging
- Check Engine Light illuminated
- Reduced engine performance
How to Fix P1129 2008 Honda Accord
- Use an OBD-II scanner to confirm the P1129 code and perform a complete diagnostic to identify the root cause of the issue.
- Inspect the MAP sensor and its wiring for any visible damage or corrosion. Replace the sensor if necessary.
- Check the intake manifold for any vacuum leaks and repair or replace any damaged components.
- Clear the fault code from the ECM's memory and test drive the vehicle to ensure the issue has been resolved.
- If the problem persists, consult a professional mechanic or dealership for further troubleshooting and repairs.
Cost to Fix P1129 2008 Honda Accord
The typical repair costs for addressing the P1129 code in a 2008 Honda Accord can range from $100 to $400, depending on the specific cause of the issue and the cost of parts and labor. It is important to note that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically falling between $80 and $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops often offer more competitive pricing. For a more accurate estimate, it is recommended to obtain quotes from local auto repair facilities.
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Frequently Asked Questions about P1129 2008 Honda Accord Code
1. What are common symptoms of OBDII code P1129 in a 2008 Honda Accord?
- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and potential stalling.
2. What does the OBDII code P1129 on a 2008 Honda Accord indicate?
- The code P1129 indicates that the Manifold Absolute Pressure (MAP) sensor circuit is reporting higher than expected readings.
3. What are the possible causes of OBDII code P1129 in a 2008 Honda Accord?
- Possible causes include a faulty MAP sensor, issues with the sensor wiring or connectors, intake manifold leaks, or a problem with the engine control module (ECM).
4. How can I diagnose the OBDII code P1129 in my 2008 Honda Accord?
- Diagnosing this code typically involves checking the MAP sensor for proper operation, inspecting the sensor's wiring and connectors, and ensuring there are no leaks in the intake manifold.
5. Can I continue driving my 2008 Honda Accord with the P1129 code?
- It is not recommended to continue driving with the P1129 code present, as it can lead to further engine damage and potential safety risks.
6. How can I repair the OBDII code P1129 in my 2008 Honda Accord?
- Repair options include replacing the faulty MAP sensor, repairing any wiring or connector issues, fixing intake manifold leaks, or reprogramming the ECM if necessary.
7. Will resetting the OBDII code P1129 in my 2008 Honda Accord solve the issue?
- Resetting the code may temporarily turn off the check engine light, but it will not fix the underlying issue causing the P1129 code to trigger.
8. How much does it typically cost to repair the OBDII code P1129 in a 2008 Honda Accord?
- The cost of repairs can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.
9. Can a DIY enthusiast repair the OBDII code P1129 in a 2008 Honda Accord?
- Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the P1129 code, especially if it involves simple tasks like sensor replacement or checking for leaks.
10. How often does the OBDII code P1129 occur in a 2008 Honda Accord?
- The occurrence of the P1129 code can vary, but it is not an uncommon issue in 2008 Honda Accords, especially as the vehicle ages and components wear out.
Discuss the causes and fixes for P1129 2008 Honda Accord OBDII Code
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2011 Honda Accord LX- 2.4L
-Replaced PCV valve. Old was original
-While checking air filter-cracked the old tube from Air Filter to throttle body
-Cleaned Throttle body intake area /glued cracked tube and silicone'd it..
TESTED vehicle and it was idling higher than before (1100-1200 rpm) - Check Engine light CAME ON
CODE indicated was 1129.
-Removed and cleaned the Manifold Pressure sensor-RE-INSTALLED and RE-Connected electrical
TESTED vehicle without A/C - It was now idling at about 800 rpm. Idling at about 900 to 1000 rpm with A/C
I'm guessing the computer (ECM) is learning the new idle settings with pcv & clean...
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