Manifold Absolute Pressure (MAP) / Barometric Pressure Circuit Malfunction
What does this mean?
The MAP sensor measures intake manifold vacuum pressure to help the PCM calculate engine load. Code P0105 indicates a general malfunction in this circuit.
Disclaimer: This diagnostic code is part of the standard OBD2 system and can apply to Infiniti Qx80 models manufactured from 1996 to 2026. However, please note that the presence of this specific code depends on your vehicle's exact engine configuration, options, and production year.
Common Causes
Faulty MAP (Manifold Absolute Pressure) sensor
Damaged, chafed, or broken wiring harness
Corroded or loose electrical connector
Vacuum leak in intake system
Symptoms to Watch For
- Check Engine Light is illuminated
- Rough or unstable idle
- Engine stalling or dying unexpectedly
- Poor acceleration or sluggish response
- Decreased fuel economy
- Difficulty starting the engine
How to Diagnose
Common Solutions
**Replace the Manifold Absolute Pressure (MAP) Sensor:** This is the most common fix if the sensor itself is determined to be faulty after electrical and vacuum testing. Ensure you use a quality OEM or reputable aftermarket sensor.
**Repair or Replace Damaged Vacuum Hoses/Lines:** Address any vacuum leaks found during the initial inspection. This could involve replacing cracked or hardened vacuum hoses, securing loose connections, or replacing a faulty PCV valve or its hose.
**Repair or Replace Damaged Wiring/Connector:** If diagnostic steps reveal an open, short, or high resistance in the MAP sensor's wiring harness or a corroded/damaged connector, the affected section must be repaired or replaced to restore proper circuit integrity.
**Address Intake Manifold Gasket Leaks:** If a significant vacuum leak is identified at the intake manifold gasket, it must be replaced. This is a more involved repair but crucial for proper engine operation and MAP sensor readings.