P1129 1999 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 1999 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 1999 Honda Civic Description
What are the Possible Causes of the DTC P1129 1999 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 1999 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 1999 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 P1129 1999 Honda Civic Code
1. What does the OBDII code P1129 indicate on a 1999 Honda Civic?
The P1129 code on a 1999 Honda Civic indicates that the Manifold Absolute Pressure (MAP) sensor circuit is reporting higher voltage than expected, suggesting an issue with the sensor or its circuit.
2. What are common symptoms of the P1129 code in a 1999 Honda Civic?
Common symptoms include engine hesitation, rough idling, difficulty starting, and sometimes an illuminated check engine light.
3. What could cause the P1129 code to appear on my 1999 Honda Civic?
Possible causes include a faulty MAP sensor, wiring issues in the MAP sensor circuit such as shorts or open circuits, or a vacuum leak in the intake manifold.
4. How can I fix the P1129 code on my 1999 Honda Civic?
To fix the P1129 code, start by inspecting the MAP sensor and its connections for any signs of damage or corrosion. Replace the MAP sensor if it's faulty, repair any damaged wires, and ensure there are no vacuum leaks in the intake manifold.
5. Will driving my 1999 Honda Civic with the P1129 code cause further damage?
Driving with the P1129 code can lead to poor engine performance and increased fuel consumption. While it might not cause immediate severe damage, it's best to address the issue promptly to maintain optimal vehicle performance.
6. How do I check the MAP sensor in my 1999 Honda Civic when troubleshooting the P1129 code?
Check the MAP sensor by measuring the voltage output with a multimeter while the engine is running. Compare the readings to the specifications in your vehicle’s service manual. If the output is outside the specified range, the sensor might need replacement.
7. Can a dirty air filter cause the P1129 code on a 1999 Honda Civic?
While a dirty air filter itself might not directly trigger a P1129 code, it can lead to engine performance issues that might stress the MAP sensor. Always ensure the air filter is clean to avoid unrelated engine problems.
8. What tools are needed to diagnose the P1129 code on a 1999 Honda Civic?
Diagnosing the P1129 code typically requires a digital multimeter to check voltages and resistances in the MAP sensor circuit, and a scan tool to read the code and monitor real-time data from the MAP sensor.
9. How important is it to address the P1129 code immediately in a 1999 Honda Civic?
It is quite important to address the P1129 code promptly as ignoring it can lead to decreased engine performance, higher fuel consumption, and potentially more serious issues down the line.
10. Can a faulty MAP sensor affect the fuel economy of a 1999 Honda Civic?
Yes, a faulty MAP sensor can significantly affect the fuel economy. It sends incorrect manifold pressure information to the engine control unit, which then might alter the fuel-air mixture improperly, leading to higher fuel consumption.
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