P1129 HONDA Possible Causes
- Faulty Manifold Absolute Pressure Sensor
- Manifold Absolute Pressure Sensor harness is open or shorted
- Poor electrical connection in the Manifold Absolute Pressure Sensor circuit
How to Fix P1129 HONDA Code?
Start by checking the “possible causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Check Engine Light On (or Service Engine Soon Warning Light)
- Engine hard to start
- Rough or erratic idle
P1129 HONDA Meaning
The Manifold Absolute Pressure (MAP) sensor generates a signal proportional to the amount of vacuum in the intake manifold. The signal is sent to the Engine Control Module (ECM) and the information is used to control the air/fuel mixture ratio. A faulty MAP sensor can cause engine stalling, over-revving, or rough idle.